I hope I never have to find out how hard it is! It's all I can do to find time to go photograph. It's hard enough to find time to coat my own paper! I'm sure I would try glass plates before I'd try polyester. I'd think that if film went away, plate holders\backs would start popping up in the marketplace pretty soon.
I wonder if the currnet liquid emulsions on the market are any good? If film went away, I wonder if other liquid pre-mixed emulsions might start showing up, too?