It's all over for albums.
When it comes to older artists and the audiences that aged with them especially, I think more people are inclined
to stream music, or that music is less of a priority for them in life. Besides, U2 had a hard enough time giving it away for free.
There will still be people happy to go see them though. You also have to factor in that many younger fans of legacy/iconic/whatever
are likely to have made up their minds about a band's "heyday" and are happy with albums from that era.
The Rolling Stones could release a new album tomorrow and tour, but I imagine 2/3 of the arena will have Exile on Main Street
on their minds, not Arthritis and Boner Pills, or whatever those geezers would call a new album.