This boggles my mind...
If Air Force plans hold up, the B-52 will be approaching nearly a century of service by 2050. To keep the airplane flying, the service plans to equip each B-52 with new engines, which are expected to be so much more maintainer-friendly and efficient that they’ll pay for themselves in just 10 years.
Another article by the same author talks of the possibility of reducing the number of crewmembers required to fly the soon-to-be century old bomber for mission capability...
Collins also said that Air Combat Command is considering the possibility of reducing the number of aircrew on the B-52, now that certain functions requiring weapon systems officers can operate autonomously. No decision has been made in that regard, Collins said.

“Discussions continue with Global Strike Command about crew size,” Collins said.
When you start with a good design, and nothing exists on the drawing board that can accomplish the same job, keep 'em flying......Ben