Re-engining the B-52, which first flew in 1952, could keep it in service until 2097, according to engine manufacturer GE. Is the B.U.F.F. just the perfect military airframe?

Re-engining the B-52, which first flew in 1952, could keep it in service until 2097, according to engine manufacturer GE. Is the B.U.F.F. just the perfect military airframe?