I didn't watch season 5 (didn't think I'd watched season 4 but turns out I did ), but I'm sure they'll find a way of getting Spacey out of the picture early doors in episode 1. He'll probably be killed by terrorists and it'll just show footage of his car exploding or something and then that'll be that.
I must admit that I am completely uninterested, although I may end up watching it. I do sympathise with the cast of the show because, obviously, of the Spacey scandals and how that may affect viewership.
For me personally, my level of apathy for it is partially to do with the actual show as I found S5 a drag, and partially Spacey, even if they write him out completely which I am sure they will. It is still tainted which is unfortunate for the cast, crew etc.