115k limit
It's not a wing "problem" - Boeing says it's the wing that imposes the 115,000 hour limit - not the pressure vessel.
Again, the 30,000 cycle limit makes some sort of engineering sense - imposing a life limit on the airframe, etc. but an hourly limit? We're having a hard time with that.
Plus the economics of going beyond 30,000 is one thing, the economics of going beyond 115,000 hours is something completely different!