I thought FFXIII looked like a refreshing return to the dystopian futuristic setting of VI and VII (I haven't played it yet), after the fairly traditional fantasy settings of XII, X, and IX (with plenty of anachronisms, sure, which even FFXIV has), so I'm not hankerin' for a return to fantasy, but I would like a better game set in the FFXIV universe cuz I like the art direction and overall feel.
I'd be shocked if SE can turn FFXIV into anything but a blemish. Currently, it's a minor one; the game is PC only, and with pretty hefty hardware requirements. While everyone's heard of it and its bad reputation, not a lot of people have personally been disappointed by it. That's a good thing. If this thing gets console release, the QQing will be off the charts unless the game is great. My guess is that for most gamers who don't MMO, FFXIV right now is just seen as a crappier FFXI, which they, like me, didn't play either, so it really doesn't factor into their decision to buy the next FF console game.
However, if the next FF game is in any way related to FFXIV, that could bother people. I know I was originally put off by reviews of FFXII which said it was very mmo-like and FFXI-inspired (and not in a good way). I ended up loving it, but I did not buy it right away (although I haven't bought an FF game at release since VIII and IX--just not that big a console fan).
edit: roman numeral typo.
Edited, Oct 6th 2011 1:35pm by yfaithfully