When you're looking at the basel or Nimes video in a row... well you can't see Mark smilling all the time
That's true. But it has been true for the other 600'000 hours of his life, too.
I was in the front row at that Basel concert, and remember thinking how awfully cool Mark was. You can't be cool AND smile all the time.
But yes, it will have been the touring (not the playing) that wore them out. It would be so much easier today – everyone would just stare at their phones constantly, no need to interact. Downside: Paul Franklin would need even more sleeping pills, because digital light is bad for your sleep.