When a band spends five years not releasing an album, who cares if they go another year without doing anything? Who is clamoring for another U2 album like the last two?
This is a holdover from the years when it was important to embargo certain things and let it all explode and rush out on the day of release in order to maximize sales and make the marketing and business people at the record label happy. Who gives a shit about that business model anymore?
U2 would be smart to record relevant music again and then just release it one day and let people download it for a nominal fee. Who cares if it comes out on a Tuesday? Who cares if there's advance marketing and a fifty million dollar promotional campaign? Put out something that doesn't try to blow the back door off of a sports stadium and act like you've been there before.