Perhaps a lesson for all of you followers of U2:
The only thing that's for sure is that nothing's for sure.
Let's not jump the gun and try to guess when U2 will stop. Hopefully, with U2 over the years, people have learned to sit back, watch, listen and enjoy. Many formidable rock acts have been able to continue viable careers into their 50's and 60's. If Bono and Co. can go, they go! Besides, U2 will never stop or end or whatever. We'll pass them on for generations to come, if possible.
I'll amend that slightly by saying U2 is in the RnR HOF in 2005!