I'm going to go ahead and give you the anecdote of myself to counter your argument. I got TTK about a week and a half after launch, play pretty often (up until last week it was the only game I was playing actually) and I still don't have ToM, am only LL 306/7, still want IB gear, still want Trials gear, still want the exotic DO class item, still want to do challenge mode clears, etc...
None of this is due to lack of interest or being bored with the game. And while I have complaints about certain things, I'm not personally unhappy with the game overall. Someone like me, appears to be a rarity here (I wasn't unhappy with the game in Y1 either) but with the stats that Bungie has released about the playerbase, I can't imagine I'm a rarity within the playerbase as a whole, in terms of being ok with the game rather than unhappy.