Yes, this distributed radio idea is a feature of both 5G and 6G. You stick the dumbest, dullest parts of the radio electronics up on the tower and trunk them all back over fiber to an aggregation/control point a few kms away, and then trunk the agg points back to the packet core a few hundreds of km away. That needs a lot of fiber to carry the backhaul. I dont know if operators are thinking of using this fiber to also incidentally deliver broadband service, but today that doesnt happen: for one, oftentimes the mobile operator doesnt own the fiber, they just lease it.