I have to say this first, do I even expect to see something like this, no. If it does happen, do I think it will happen in less than a year, no. I would consider it amazing if it did happen.
I would love an upgraded Chromie Time.
At the least, it would allow you to queue for old world heroic dungeons. I would not expect to get heroic level gear, I would be happy enough if it just was current normal dungeons ilevel. The point is not progression, but content to play.
The reason comes from a simple fact, WoW has a lot of lost content. There are more than 100 dungeons in WoW and that is just the current ones, not the original versions of those dungeons. Why do I say they are lost? It is because you will never see most of those dungeons when leveling. Some are heroic only, which you have no reason to do since you get worse gear from them than you do in the normal difficulty. Then there are the level limited ones that you can only do at the end of the leveling, but you usually will not be able to do them since most of the players can only do the early ones. LFD will throw you into the low level ones for that reason.
I loved Cata’s heroics. I am one of those people who enjoyed the difficulty. Having the difficulty set to heroic lets for more challenge than the normal or even timewalker difficulty. There is also the fact that it opens up heroic only dungeons. This means more content and hence more reason to play the expanded Chromie time. As a quick comment about difficulty, I would definitely disable any borrowed power and decrease ilevel to the one the dungeons are expected to have in them. Dungeons are REALLY boring when you outgear them.
Now, why so many comments on content? There is always going to be lulls in content. This is because it takes time to create new content and test it. By opening up old content, you can choose to do it to have something different to do than just run the same stuff over and over. There are people who prefer the older content and hence would be more likely to play retail if they can do their favorite stuff. I am definitely in this category. Or to put it bluntly, you can take a day and just do dungeons that you have not seen in a decade or have never seen at all.
In an even better world, I would not limit it to just dungeons. I would allow you to reset all quest status (but not necessarily quest rewards) so that the areas you liked a lot could be done again. For me, it is Howling Fjord and Grizzly Hills. And to make a problem clear, I almost always hit max level before I finish Grizzly Hills when leveling an alt. I actually had to exp stop a character so I could do more. Once again, there are THOUSANDS of quests in WoW. You can either redo places you liked or new ones if you never played the old content. And doing them as a movie rather than a game is really boring. And it does feel like a movie when you play it at max level. You one shot everything and never get a feel for the gameplay behind the quest. A lot of the same comments on rewards and difficulty as dungeons. Set an expected ilevel to the player and ilevels rewards that do not override current content.
If they would be willing to go even further with that, allow Chromie to send you to the Classic overworld. Aka, you can play on it with modern gameplay mechanics. They now have that overworld updated to the modern engine, so it should be less problematic than before WoW Classic came out.
And now for the least likely item. Apply it to old raids. One of my favorite raids of all time was Kara. It was about 90% of the reason I played TBC Classic. If I could do it with the difficulty of blue gear, I would do it every week. And yes, that includes no real gear upgrades. I would run raids of it just so people could see and do it.
There is even more I would love to see, but that is getting into the range of a remake than just making old content a way to fill downtimes.
Regardless of all else, I just want to do heroic dungeons at the difficulty that they came out with.
