Didn't Bono say three crap albums in a row and they're done?
No, that was "two crap albums and you're out". Luckily they don't use the internet fandom criteria or there'd be no more U2 after 1997.
What's all this "last album/tour" talk about ? They're pushing 50, not 70 or 80. I don't see it, unless they completely grow tired of each other or something disastrous happens to Bono's vocals or Larry's wrists/back.