In 1948 (I think) Boeing produced at least one blueprint of the B-52 with swept wings and turboprops, a la Tu-95.
The Soviet / Russian Bear has lasted to the present day like the BUFF, although the Russians did keep the Tu-95 in production longer.
So would we be seeing prop powered B-52's in service today, having served in Vietnam, Iraq, Afghanistan (and Iraq again)?
Or would it be easier to make a case for replacing the B-52 much earlier based on an even more antiquated appearance?