You asked a very relevant question, only I don't think you realize that it really is a question and actually the one you SHOULD be asking. The question you SHOULD be asking is this: are companies producing, or even willing to produce, content that satisfies your need for "challenging" and "lasting" content.
By the way, the answer is a resounding NO!
Companies don't have the resources to provide endless, challenging, satisfying (to you) content. At least, not at the price you're willing to pay. People on the side of the argument in this thread supporting your OP assertions keep bringing up SWTOR. The problem there wasn't just no endgame content. It was primarily the fact that in addition to there being no worthwhile endgame content there was also no satisfying alternative content. That's just not the case in XIV. This game has a much healthier amount of content in general, and for those who don't locust through content there's even plenty of endgame to play.
The problem is, folks who have 40+ hours to play weekly simply will never have enough content, and games will never be challenging enough for them to play. If you've ever watched the movie "Inception" and really thought about the problem with drawing mazes in 1:00 that take more than 1:00 to complete, then you might start to understand why this is a problem.
(Hint: with a collective intelligence machine, i.e. MMO players, there's no conceivable way that a person, or even a limited team of people, can draw a maze in 1:00 that takes longer than 1:00 to solve. It just can't happen)
You people just need to start having more realistic expectations, and that will largely start as you get more realistic engagement with life in general. If you're spending 40+ hours on a game each week, frankly your life is so wildly out of balance that you have clearly ceased to be a functioning member of society. Go, do something productive in real life. Now that game developers are focusing on games that appeal to those of us who have that balance, you'll find that everything works out better in the end.