Sunday is coming early it seems.
All you’ll be getting from me OP is a big , fat, NO. 
Yeah not able to solo vanilla and BC raids at this current level would literally make zero sense and take almost forever to find groups for whichever old raid you wanted to do.
I had a longish post about old raids then realized the last part made it null and void, so here is the last part
Time walking event.
And you are no fun.
For many, many people, running old raids and dungeons for tramsog is part of endgame.
Your suggestion would take away a large chunk of an already dwindling player base. It’s a stupid idea 
LMAO! gear? what gear will sunwell plateau give a level 120 that’s useful? pets are worthless and so are mounts. only people who care about other people getting mounts are jealous they dont have it.
Personally i dont care about mounts or pets i use 1 of each and only because it was easy to get the pet and the mount was cheap in the ah. i do old raids for transmogs.
So how about you not demand other play the way you want to play hm?
that or go find those friends off time walking.
And wear the gear of the expac. No corruption, no neck, no ap gear.
I wonder what inspired you to write this
The problem is less about soloing past content, and more about the activity of doing so is superseding the value of current content. With that said, there was a bit of satisfaction soloing content pre-WoD, having to come up with unique ways to beat it (with higher chance of failure) rather than just tossing your body at the instance.
Go play Classic WoW if you want to play old raids that aren’t able to be soloed. Your request is duly noted, but it’ll never happen, so I’m not worried about it.
It depends how we define old. Last expansion, sure i can agree.
2+ expansions old though…should not just be solo but faceroll solo.
I’ve been farming Invincible for months. I know people who have been for a few years now. Most raid-related mounts have a 1% or lower drop rate. They are not easy to get. They are, in fact, insanely time consuming to get.
that’s what current content is for
Um why? You made no solid point OP.
Hard pass, my friend.
No thank you. I only get one shot a week, per toon as it is.
Appropriate for time walking but your idea for players to depend of other players for carry will only lead to the game becoming a pay to win game.
Turning access to raids into third microtransactions is kind of a laughable idea.
That’s a solid way to drive people away.
If anything, ask for them to make your idea an OPTION, not completely remove something a LOT of players enjoy for mog and mount purposes.
I think it’d be cool if all items from all previous raids would scale up with the level of the group, so we could, for example, get a 470 version of a dragonspine trophy from waaaaaaaaay back when. But if someone wants to run the unscaled version for mog purposes, let them.
I’m sure the scaling would just break the game though lol. Everyone would just be farming an arcanocrystal lol.
Instead of being forced to have a group, all the old raids should be soloable. HOWEVER, I do think there should be an option to queue as a 5 man to run them for better loot.
In fact, all older instances, be it raids or dungeons, should be able to be run at all times (no timewalking necessary) with a random 5 man and scalable loot. That would increase the longevity of older content, and give more people things to do.