I don't believe they changed directions because of Pop backlash and joking. I think they changed because that's what U2 does, they change. Look even though JT was a HUGE success, they changed with AB. They'd have put out ATYCLB regardless of if Pop was big or not, because that's where they were at that time in their lives.
However, I have read interviews where they admitted they had been running from being U2, and Edge convinced them it was okay to be themselves. They were practicing one day and Edge played a riff and Bono said, 'no that sounds too much like the Edge, too much like U2' and Edge said 'but we ARE U2 and I AM The Edge. What's wrong with that?' It gave them a realization that being what they really were wasn't a bad thing, they didn't have to go out of their way to try to be something else just for the sake of saying 'look at me I'm different!'. Also, in another interview, they told about how a 'DJ saved my life tonight' by pointing out to them that their music was so much better stripped down without all the extra effects and noises they'd been using. And of course Larry and Adam were worried about being 'replaced by a drum machine.' But in the end, U2 changed and changed again, because that's what they do.