To the suggestion that migration is an option (especially to Programmers.SE and not instead to some dark nexus of evil questions), I have only one thing to say:
Poll and "fun" questions aren't on-topic anywhere on the network, so please get it out of your mind that they can be migrated somewhere successfully. And Programmers.SE is not Stack Overflow's toilet bowl.
If you don't want them on Stack Overflow, they should be closed, locked, and/or deleted. I can't imagine flagging every single question in the list is a productive use of already over-worked moderators' time, and deleting 600+ questions at once just because they have a specific tag on them seems incredibly risky.
So I'm of the mind that they should just be deleted or locked as people run into them organically. Many of them are months or years old: they aren't harming anyone by just staying put for a little while longer while they get evaluated individually.