If you really love both bands it's great but in general i think it means higher ticketprices,shorter setlist,more people wanting VIP/first rows,and part of the audience that is only interested in one band and doesn't have the patience to listen to the full set of the other band.
All i want is for them is to mix up the setlist more but i think it's not that they don't know it's become predictable but it's a concious choice.From everything i've seen and heard the last couple of years my guess would be Adam has more problems with his memory.He forgets more lyrics ,messes them up ,uses more tools like papers or his phone to remember. If you have to mix things up every night that's really hard.He seems to have no problems with the new songs but the old ones that they have done so many times in the past seem to be the problem.
As i get older my memory isn't what it used to be either but use of medication and use of alcohol can also influence that.
I really really hope i'm completely wrong.