What are your opinions on antivirus programs?

I've just recently looked a bit deeper into it and it's scary how useless they've become... Especially signature based ones, as 82% of all malware only gets used once before they get changed again and 70% of them are only active for >1h.
Also, if you're able to google and have a slow sunday, you can easily write your own virus that won't be recognized by AV. It won't be a devilish masterpiece, but it'll work.

Do you think AV (especially paid ones) have a future?