I'm with da pope on this I honestly don't think Better would do that well on mainstream radio, it's a tough one to call and if it did well it may be more due to the name of the band than the song. I really love Better but there's been a very mixed response to it when I've played it to people, my girlfriend liked but two of my friends who are into rock music didn't they thought it was ordinary and were both like wtf? when the synth kicked in at half way.
If Better is released as a single and goes to number one I'd be delighted, I just wouldn't be surprised if it didn't.
I disagree that if the original guns reformed and released a song it wouldn't get in the top 5 though, I'm certain it'd go straight to number 1 ?