In my opinion, the main problem facing U2 recordings since Pop is the band's taking too long to finish things, and overcooking tracks that were already done (case in point: the current 17-year break between albums). Even Eno complains about this, and he's their producer! I actually think Pop would have been better if they'd had about four months less to work on it.
It's just my speculating of course, but what seems to be happening in the last 15 years of U2 records is that the band has a vision for what they want to do with a new studio session, then they go in and do it, and then they decide they have to have more 'hits' or something and so they go back and re-work things to death, killing much of the initial inspiration for the project.
This is in contrast to the 80s, when they had strict deadlines to follow and, as a result, never produced an album that sounded compromised. There is the rare case of artistic inspiration being balanced with long, long studio craft, but I think more often than not the band benefits from capturing things refresh.
So, no, they should not re-do anything from Pop now!