If the news broke out the same afternoon of the concert....
... It depends the kind of news, it might affect the rest of the band.... but lets suppose it doesn't , it's just a night outta town, but this time Edge's style.
- I believe that nowadays Edge's voice is a fundamental support for Bono's. Buenos Aires 2nd (and parts of the 1st) concert sometimes reminds me of parts of Sarajevo's 1997. Edge and the audience did a lot of the singing, Bono reserved his voice well for the parts without Edge's backing or people chanting, and performed them well.
- You have to consider whether Dallas can go through with the keyboard parts or if we would have a 5 men band, with 3 members and 2 technicians for New Year's Day.
- Also, Edge's was normally the 2nd performer of the Band (Adam is really closing the gap now, I believe), this would bring all the weight of carrying the show to Mr. teleprompter (it's funny to call him that way!
(*)). Adam should be also in a great night to carry this.
I believe Adam and Larry, as they are not that big part of the stage and show visual and being not that multifunctional are more replaceable.
*: I'm so naif that just recently discover ed the teleprompter showing not only the foreign language , but also the english language speakings for Bono. And also.... WOWY lyrics!