I guess it is a question at what point does a remake become a vastly different game? A complete remake like FFVII most likely every aspect will be altered. Maybe the overall story will be the same and the characters will look similar. What made FFVII something worthy to be experienced in the first place? Some things are products of the time as are the memories of the people who played it on release.
Any remake that is done will certainly have people who hate it since they have a strong emotional attachment to the time and memory of the original. Best we can hope for is a remake be a good game regardless of the original game it was based on.
Resident Evil Remake is the perfect remake of an older game. It retains the core elements of the original but improves and introduces new mechanics and sections. Not the same game but a great experience. I love both versions of Resident Evil, one for nostalgia and the other for how good it is on its own merits.
A game I would like to get remade is the original Deus Ex PC game. However that is probably never going to happen since Deus Ex: MD flopped and Edios is on to other things. I could see a Deus Ex as an equivalent of Breath of the Wild in terms of free form physics gameplay. Deus ex could be helped with modern cutscene composition akin to The Witcher or Deus Ex: MD or Human Revolution.