Naturally, I felt compelled to voice my opinion about how dumb of a move this was, since wikipedia is packed full of useless tags, and they want to delete the most useful one in the entire encyclopedia. So I voted "Keep" for the tag.
My vote got deleted, and an automated bot posted this nice little message for me:
! I noticed that you joined the discussion on Wikipedia:Requests for comment/Policies/Wikipedia:Spoiler warning?. Participation in the community is encouraged, of course, but your status as a brand new user means that your opinions might not be counted.
And that settles it. Wikipedia is retarded.