I don’t agree with even that. The jump between normal and LFR is pretty damn big.
It’s just the jump in quality between random matchmade groups and premade groups is even bigger.
LFR groups would get obliterated by every first-Mythic boss that’s existed this expansion.
The lantern would be smashed near immediately on Shriekwing, you’d have half the group taking Ten of Towers and Lumbering Form on Tarragrue and a solid 40% of the group would get obliterated by the first AoE on Vigilant Guardian.
I think it’d be fun to try.
Part of the reason I jump into LFR is for the pure Chaos of the raid itself.
LFR for mythic raiding? I have a few doubts just because I play LFR sometimes and I feel that many players at that level would not be anywhere near prepared for mythic, especially the later bosses. LFR does not have a guaranteed leader, and even if it did, there would not be the security of an established group supporting that leader, or power to remove people who don’t play as a team.
For now, consider that LFR uses determination, which can be a 50% damage done AND healing done AND health pool buff. Some groups need all ten stacks. Some groups struggle with 10 stacks. For this to be fair with other difficulties, I think determination could not exist, and the bosses would be harder. All in all, I think that LFR for more challenging modes could possibly work, but it would require player growth, and much more patience than I have.
I can see the threads now:
“I waited in queue for over 2 hours for the current tier raid, and 3 hours later the boss is IMPOSSIBLE”
The threads would be pure gold.
Get Rid of LFR Create a Overland quest system ( NOT WORLD QUEST) that is heavily story based and provides decent gear that will give you a Gateway to Raiding if you choose, Create a Companion system and provide Level based Dungeons that one or two people can complete.
Only Raiders will go near raids after that and casuals will have their own game. The player count will increase exponentially.
Thry are terrified of splitting ques in this game, but they could have a rank system whereby if you avoided mechanics in lfr you could unlock a lfr for normal… that would reward actually learning mechanics vs unga bunga cuz que.
But just like having a 2 tiered bg system where all the nads who do nothing are put in purgatory blizz wont do it.
Why?
Can LFR be completed without a legendary? Yes? Then why require it?
That was literally the covenant campaign/gear.
If that was true why did Ion tell Asmongold that content for Casual players was something they fell down on, but are trying to change??
It’s exactly what you described, regardless of what anyone told anyone else.
Maybe the issue is your idea of what would bring back drives of casuals is wrong.
Slow your hate sweat lord it was just a thought… 
Probably because if it existed, the endless whining about difficulty would cause Blizz to cave and neuter the raid.
If they vowed to never alter the difficulty or mechanics but only add a random organizer, I’d be 100% okay with that. I’m not even a raider but I’d give it a try for sure just to see the mess.
What hate? You described something that we already had and said it would bring back tons of players, which we know it didn’t.
Then you tried to gotcha! with an ion interview question that only showed that ion agreed that what they did (same thing you suggested) didn’t work.
Ergo: your suggestion probably isn’t the solution.
Because casual content isn’t only tied to the gearing process.
An entire raid filled with hapless folks bumbling their way from pillar to post, never really get their gear set up properly, nor learn their skills, think mechanics are for sweaty nerds, and dying is no biggie. You do NOT want these people anywhere near a heroic or mythic raid unless they’re paying for a carry. Have you seen how awful LFR Anduin is? Do you want an entire raid like that? Every boss… every week? Because that’s what you’d get.
I think with enough Determ stacks vigilant would be possible haha but you’re probably right. There’s still a lot of dodging and tank movement.
M Tarragrue was pretty easy and probably would be the best first boss for an LFR group to prog on. Determ stacks and 30 people with perfect anima powers (Immune to Fear, Weights, ToT, +whatever). Probably wipe a lot to people not soaking but that fight is pretty free.
How is overworld questing going to prepare people (gateway) for raiding though? The problem as it stands is not gear. If people want to jump from world quests / LFR / queued dungeons up to raid normal mode they’ll have to get better at their class and at pushing their buttons.
it’s true that if you have people doing good damage you can carry the people who come in and barely manage 3k. i don’t think that “what’s the absolute bare minimum?” is a good target for tuning.
it’s free if you have at least a handful of people who know what they’re doing, which is the furthest thing from a guarantee in LFR 
Oh come on…lumbering form wasn’t that bad lol. But yeah, good luck getting an LFR group than can clear the end of heroic or the beginning of mythic. Even some normal bosses like anduin where one star going to the wrong place would have the potential to be a nightmare.