I'm a fan of Forbidden Planet, and a remake could be interesting, but you have the "John Carter of Mars" problem. Which is to say, later works have already redone everything unique about the original. What does a new Forbidden Planet bring to the table that Star Trek hasn't already done multiple times?
Just guessing. If it ever happened, it gives Amazon their own star-trek franchise. These are the people that paid 1 Billion for what essentially amounts to well done Tolkein fanfic. Same reason Lost In Space keeps getting revived.. it's there and it seems like a competitive product. The original movie itself is a good story, being built on the bones of The Tempest, so a remake, if they did not screw it up, might succeed. It's been suggested at least a couple of times. At one point J. Michael Straczynski was working on a script.