You can write a great pop song that sounds innovative, but even if U2 do that, it won't chart because of it being good song, rather, because of their name value.
The majority of people who listen to the Top 100 could care less about originality.
Adele's rise to the top was probably because she was a different change of pace.
I think U2 are deemed "uncool" by too many for them to really score a top 10 hit again.