Don't see the point. Unsubscribing is generally faster than going through the motions of setting up a filter. It's also much more polite. I reserve filters or "mark as spam" for only the stuff with a missing or malfunctioning unsubscription option.
Well - that is the point! The filter should be faster than the "Unsubscribe"! :)
I'm not convinced this is a real problem though. I don't think I've ever thought to myself "man, hitting this unsubscribe link is so annoying, I wish there was a better way!". Plus, why keep all of these emails in a label when you can just opt-out of them at the source?