I think it's fine this way.
While I haven't done Ultimate (yet?), I still enjoy the community buzz of following those that do, don't get me wrong. And it's not like I particularly care about only getting 1 dungeon because of that either, because while dungeons are nice the first 3 or so times they quickly shed their guise into the same trash smash with maybe 1 cool new boss mechanic. That said, I agree that the amount of people clearing it means making it a staple for every single odd patch is a bit much. Two per expansion is plenty enough. The .5 patches at the tail end of the expansions especially suffer the longest dry patches while the next expansion is finalised, so I think it's best that the time and resources go into bolstering casual content at that point in the patch cycle.
