If that ever happens I'm sure they'll improve the leveling system for the Old World quite a bit.

We've all had discussions about raising the starting level, for all classes, and it works fine but there has to be a level cap at some time. Some number that they WON'T raise, at any point, in the future.

The level "cap" for WoW is 255, that's the cap your level can be. You can't be higher than that unless you recoded the game. Players can't reach level 255 but that's the highest achievable level AT THE MOMENT. If we get to the point of becoming that high, I'll just find it far too over exaggerated.

Level 100+ would already be far too much for me. But only because of the leveling rates. It is a lot easier to level from 1 to 60 now than it was in vanilla WoW but that doesn't change the fact it still takes time. And then when you get to 60, instead of being "Woot, only 10 more levels!" in BC it'll be like "Sigh... only 30/40 more levels..."

So my point is:

Levels aren't a problem. You can have a level cap of 1,000 for all I care. But it's the time it'll take to get there that counts. And I doubt they'll change the XP rate so much that we get 2-5x more XP than we do now (Old World) but adding more quests or changing the starting level may help when they eventuality happens.