Yeah, that's all very well but having 90% of posts within a thread having spoiler tags in would drive me nuts... Which threads would as most discussion after a programme has aired is about that program...
All you'd have left is the "can't wait to watch the show later" posts...
Indeed, but people aren't going to stop going out of their way to watch shows before they're aired in the UK.
I think a better option would be to allow for two threads, one for spoilers for those that can't wait and one for those who can.
Seen it work in other forums.

