What constitutes a Final Fantasy title can be highly subjective to the player. I prefer the older Final Fantasy games to the newer Final Fantasy games, but there is a divisive line between each set of Final Fantasy games that come out for a console.

The Final Fantasy games that were available for the Nintendo were a lot different than the games that were available for the Super Nintendo. A lot of this has to do with hardware upgrades, but there are some thematic changes from each set.

I won't say that the series is over until the developers say that the series is over, but I know that I personally lost a great deal of interest in the titles as the development time for each title took a lot longer than it used to.