it's funny because i asked my 15-year-old, the other night, if any of his mates are into U2... we live in France so i kind of thought there would be a chance that some French kids might be into U2 compared to England where that would be unheard of among teenagers, and he thought about it for a bit and actually said no, he couldn't think of any mates who were into U2, they "like" them and thought it was cool that we got to see them last year (although the enthusiasm did mostly come from the parents and teachers really lol)
it's not about bands keying into what's happening right now though, it's deeper than that... my son is a massive music lover, he is right up on his music history, and he is really inspired by The Clash and Bob Marley at the moment, especially The Clash... i can't put my finger on it, but their music just seems to speak to him right now and he really just connects with it, i don't know whether it's to do with teenage rage and needing loud shouty songs or what, but he is also drawn by their message - he is incredibly political and an activist compared to his peers and for his age... he likes the message behind the music... so it's not necessarily a "contemporary" or "trendy" thing for him, it's just what "connects" with him where he is at, really... he is also big into rap (Eminem and some French rappers) and thrash metal (Slipknot, The Disturbed etc.) right now as well lol he likes a huge range of music but U2 really just doesn't grab him...
he did like Moment of Surrender a lot when he saw them live last year, not one i would have expected to appeal to him, but there you go!
tbh, i haven't really played my kids much U2 at all, and i guess they've mostly just heard the latest releases/new songs as they were growing up, so they haven't really listened to much of their back catalogue, and i'm wondering how he would respond to their earlier more energetic/raw stuff... maybe i'll dig some out and see what he thinks...