I don't think FF16 will have the same budget as 15 got. And that's probably a good thing, I think SE needs to go back to basics with the franchise and the budgets of the FF games and emphasis on graphics have gotten out of control.
Square-Enix bet the farm hard on this and got burned and won't be able to overship next time either as retailers will remember.
Also Nvidia GFLOPS ratings tend to be 30% better than what AMD provides, so a 700 GFLOP Nvidia chip could punch pretty close to a 1 TFLOP AMD chip.
For 720p, I think ports should be doable. Japanese gamers don't really care about things like 4K or even 1080p I doubt. The portability aspect of the Switch is far more in line with Japanese tastes, it's why Switch will outsell the PS4 + PS4 Pro combined in Japan probably relatively quickly.
In 3 years Nintendo can release a better version of the Switch with 2-3x the performance.
