Suggestion 3: Future-proof content by capping at least instanced fights and dungeons.

[Krausus]

I doubt it would require that much work to be honest, yes currently the game is end game heavy but that's not to say 2.0 will be, where such a system could be a nice addition.

I'm betting it would take a lot of development time and yoshi already stated he wanted to focus on high level content you can really see that when every patch makes it easier and faster to level up to cap.