Since the Square-Enix merger in 2003, FF-affiliated games have, by and large, ranged from mediocre to total hog tit.
The business plan seems to have started with 'cash in on the already successful games in FFVII and X by releasing needless spinoffs', moved steadily forward to 'cash in on the franchise itself by releasing needless spinoffs', followed by a deft change of tack, and a decision that their offerings for the main series took too long to make and cost too much money, so instead they'd 'remake' the old ones and palm them off as exciting new titles, and finally, gave up altogether.
The question is not why, as the answer is that sweet, sweet consumerist money, but how. How has, in the space of ten years, the Final Fantasy series gone from a pillar of solid videogamesmanship and something that would provoke a respected "Ah, yes" when inserted into any 'great video game series' discussion, to just another one of those japanese game franchises, that can often be found mingling around the bargain bins and pre-owned sections of HMV, as something that would garner warnings such as "Go ahead and buy, but only if you're a fan of the series" in the footnotes of monthly magazine reviews?
Are you going to buy Final Fantasy XIII Type-0? There was a time when I would definitely look at it as something I'd add to my collection, if only on principle (I made this mistake for the last time when I bought X-2), but now, I'm not even considering it. I just know that it's going to be average.
EDIT: Some might say this belongs in general FF, but this is more a rag on Square-Enix, and I already put pointless thread 1 in there, so, in short, you're wrong.