I can't really see where MMORPGs can progress to that you may be referring to. The entire point in having dungeons/raids/instances is to have repeatable content that their subscribers can do so they will continue to pay to play. If you don't have that, and people manage to get through all the available quests within a 3 week period (or considerably shorter in some cases for those with apparently a lot of free time), then you lose those people to something else. In such instances, people are playing a single player RPG that you just happen to be able to play with other people.

So far the progression that I can think of is:

Table Top RPG>Console RPG>MMORPG>LARP???