the song is fine. needs a Edge solo, and not a California/SFS stock solo that Edge throws in. A fly type of solo would have been amazing and fit the song. Doesn't have to go on for a minute, but something aggressive and fun
I dug what TBT was last year when we got the beach clips. The Kygo remix is just that, a EDM remix and it was fun and bouncy.
I don't think TBT is going to get them radio play, and that's going to really disappoint the band. It's sad that radio is what it is now, but what can we do? Remember back in the day when we'd call radio stations to get Beautiful Day and other songs off of ATYCLB on the air?
Now it's just Youtube hits
TBT will get radio play for sure, but it's just a matter of what format. And what format it gets played on will matter how good/shit the song is and how accessible it is to modern, younger audiences, whether different versions will be released to different formats, and how well Interscope promotes it.
However, regardless of the content of the songs itself, based on U2's most recent releases you can almost be assured of these things:
It will most likely go Top 5, if not #1 on Triple A radio.
It will probably go Top 30 on Alternative radio for at least a week or two.
It will probably get some, but not much airplay on Mainstream Rock radio (ie. not enough to chart) given that it's all really shitty hard rock now.
It might also get serviced to Adult Top 40 and Adult Contemporary radio, where it ends up in the mid-20s or 30s on that chart.
The big "if" is Contemporary Hits Radio (aka straight up "Pop/Top 40 Mainstream"). This is the big one. I don't think U2 have made the slightest waves (ie. gone into the top 50) on this chart since 2005. Though they've released some singles since that have gotten minimal airplay on the format ("One ft. Mary J Blige", "Boots", "Song for Someone"), these songs made almost no impact and their airplay was very shortlived. If the song does well, I could see it being released to this format (maybe the Kygo remix), but I doubt it would get anywhere near the Top 50.
There's also the Dance radio format which U2 has a shot at with this remix, but it's a very very very limited format with few stations in the country.
As far as youtube views go, it will again depend on the quality of the song, marketing ability by Interscope, radio play as well (or general exposure to wider audiences through some medium).
But here are recent video stats:
Boots - 3.7 million
Magnificent - 30 million
Crazy Tonight - 6 million
Ordinary Love - 40 million (Tonight Show live 16 million)
Invisible - 11 million (Tonight Show live 4.5 million)
The Miracle - 6.3 million
Every Breaking Wave - 14 million
Song for Someone - 9.2 million (alternate video 6.8 million)
The Blackout has 9.1 million views in the past 5 days alone (on facebook too, which a lot of people don't use anymore - Youtube reaches a much bigger audience)
Do with that information what you will. I'm guessing TBT will hit 20 million in the near future simply because it's U2 and seems fairly poppy, but could go higher if it's at all a crossover hit (and if the remix gets it's own video too).