You barely know what we're getting yet you know you won't buy the game unless it's 80% off?
Yes. I will judge any remake on how well it is doing at being the game it is intending to remake.
For example, XCOM does a decent job at taking the UI-plagued basic gameplay loop of the original game and make it something more modern. Last year's Doom took the core idea of Doom, running, gunning, secrets, and demons on Mars and made a modern game embracing those ideals. Contrast Doom 3 which did not. It did its own game decently, but it didn't do Doom well. Never mention X-Com Enforcer in polite company which failed at everything, up to and including being an X-Com game, let alone a good game.
With what they're saying about FF7 Remake, I'm expecting something between X-Com Enforcer and Doom 3. At worst, it'll fail at everything, and at best, it'll be a fine game, but not a fine Final Fantasy 7.
And I might be a little too aggressive with 80% off. Let's say 66%. Pay a third of the price for a third of a game. Fair's fair. I might pay full price for a full game compilation. If FF7 Remake episodes 2 and 3 ever get made.