First the Last Guardian, now this?
I would go out and buy a PS4 as soon as the money was available, they have given me plenty of reason to buy one. That being said, I think I'm going to sit on my hands a little while in case these games take so much longer, they get re-announced for the PS5.
As for the trailer, that narrator sounds so incredibly uninterested, I hope that's not the voice of Cloud or Sephiroth.
In regard to FF7 getting remade in general, I don't think it will get stellar reviews, not because it's a bad game, but because the material is no longer unique. FF7 was a product of it's time and it was special when it came out, the themes expressed within have since become the standard (so it wouldn't feel like anything special to gamers or reviewers today). I'll still buy it but I hope they keep Cloud's personality more like it was in the original rather than sharpening the edge.
Also between this and the whole taking feedback and actually listening to it throughout the development of FFXV [http://www.rpgfan.com/news/2015/3070.html], my love hate relationship with Square Enix tilts toward the love side, for now.