It just won't be the same (for me newayz).
Like if they release a sequel for a movie that had better special affects, but overall turned me off the series (hmm let me think.... I know Star Wars!!!!).
If they have voice acting and they don't get it right, that annoying voice (say of Cloud) will be in my head every time I play/think of FFVII.
Just to give you an example of a way that a remake can ruin my overall feelings of a series (for me).
Don't get me wrong they could pull it off and make it way way way better, but I am still having my doubts about it
EIther way, I loved FFVII (first turn based RPG I played).