I have a CoH thing in my mind that's completely irrelevant and unrealistic, but I thought I'd try bouncing it off people who knew the game better in the hopes that they'd be able to point out how ridiculous the notion(s) are so I can stop imagining them.
The notion is something like - could the treadmill be pulled and the game still function. Specifically, there's really not that much difference between my lvl 8 mission and my lvl 43 missions, as evidenced by sidekicking/exemplaring.
The question is, could the what, 0-54 levels of 'difficulty/power' be collapsed into 7 or 9. In short, the difference between a Hellion and a Sky-Raider lore-wise have been artificially inflated such that we can have 54 levels of leveling, and it would be interesting to see a realm without out - at least in my mind.
Well, I can't speak too much of the mechanical scaling of such. @brw316 is the most knowledgeable person I know for understanding the basis of how power scaling and balance works in City of Heroes, so I'll have to defer to them for any depth.
Instead, I'll give an example. There's another rogue server that made it so that all story contacts, enemy groups, and zones were scaled to your level. This is great in some ways because it means you can't really outlevel contacts anymore, but on the other hand... Hellions, for example, straight up do not have the firepower or scaling to contend with high level characters.
The lesson learned is that while there's kind of ways to get around it, it requires quite a lot of custom work to support it and keep balance intact. Given that I'm a former Guild Wars and Guild Wars 2 player, I'm all for flattening and lowering maximum level caps because I've never enjoyed the treadmill / vertical progression methodology so prevalent in older MMORPG's (and most new ones, let's be real).
Either way, it's an intellectual exercise at most. Rebirth is fundamentally a 'what would the original developers have done' server, and there's absolutely no way they ever would have changed the level cap. Their method of adding progression was adding the incarnate system, which they had plans for infinite expansion of as necessary.