Well, it's one thing being spontaneous when you're in your 20s, but try late 40s and 50s...I'd rather they spend more time (within reason and provided there isn't a problem with the sessions/producer, more than anything else I'm worried about the reports of increased hard work in the studio, re: last three albums, it's like it's work and not making music) and make a better album than rush things just for the sake of having something released. I also don't think it's quite necessary we get a U2 product each and every year (or even several products at a time like Zoo DVD, U2:18, and U2 by U2last year), be it an album, single, DVD ... but perhaps with the big US label, things changed once they weren't with Island anymore in this department.
That said, I always thought the much talked relevance would actually push them to work more/faster...I don't think anyone expects an album every two years, personally I'd settle for the timing a la Pop-ATYCLB: 3 years between albums, 4 years between touring. And I'm definitely OK with it if they loosen up a little and stop worying about the US market so much.
Perhaps, as age is catching up, they will consider less (read: shorter, less extravagant) tours for more album output. And Bono will probably, eventually, tone down his activism travels.
Didn't he say he is looking for someone to take over in the last few years?