Yea, as much as I would like a progression server - I think that would be great. I don't see it happening, I think the amount of work and time needed to get that done may be beyond what they're willing to do - considering the Steam release was apparently going to be launched as-is, without even having new servers.
I'm glad they're launching on Steam and I'm happy to be getting new servers, but I'm not expecting anything else beyond that.
It is possible, within the timeframe, to simply cap the player level at 50, then slowly raise it over time, but everything would still be there, such as CoO/Xaviera. Still, it would be "something".
True, I hadn't thought about simply lowering the level-cap and leaving the rest of the content in - that's not a bad idea, I wonder if they've thought about doing something like this?
Well, you still have the problem with the stats you get from minigames and honor points giving you OP stats for a level 50 game (making it maybe boring because you can burst everything? idk), so they would have to disable those too. And the proof of the mythos tokens later on as well.
Edit: And the stats you can get from mementos and the other (red) currency I forgot, in the higher zones (Lv67) that still would be accessible.