I'm an "old" fan and I don't hope Final Fantasy returns to its roots. That doesn't mean that I think the roots suck (although that is kind of what roots do irl! lol.), it just means that I've already played final fantasies (and other RPGs) in those kind of settings tons of times already. Also, almost every final fantasy, no matter how new or old it is, has that "some super-advanced dudes used to live on this planet but now they're gone and we have to unravel their secrets" thing going on in them. There is almost no final fantasy that doesn't have hints (and sometimes way more than just hints) of high technology (or magitechnology!) spread around their worlds, so high tech stuff is very much part of the roots of the series anyway.

I'm personally a big fan of near-future settings, and that is why I initially was so stoked about vs13 I MEAN FF15 in the first place. I greatly enjoyed the settings of FF6, 7, 8 and 13, and the parts I remember as some of the most awesome in 4, 5 and 10 are the ones that deal with exploring the lost technology of the world.

The "perfect" game setting for me is probably a world that technologically is within 100 years into our future, and also has magical forces, ideally a bit subtle and not very inyoface.