Final Fantasy naysaying is to be expected from such a popular franchise. I think this hyped thread and the posts in it are less an exercise in legitimately predicting the future of the series and more an excuse to rage against the machine...figuratively speaking.
Final Fantasy will be around for a very long time. The fact that the games are noncontinuous from one another virtually assures the series' longevity, because each game can be something completely new, which means that in theory, so long as there are RPGs, there will be Final Fantasies. So long as the Final Fantasy name itself doesn't become a liability, either by becoming unpopular or by wrapping itself around a very narrow slice of the RPG genre, they'll be making this 'till the end of time, so I guess that I will pay for these new games till doomsday...do do do do, do do do do, do, doooo, do-do do-do-do do do, do do do-do-do do doooo!