This is pretty far out, so I just pose it as a question for notion or ideas, rather than conclusive answers.
Considering the differences in flight characteristics between the Boeing 737 Max-8 and older models demanding the creation of MCAS and subsequent problems and crashes;
would it be possible to bring the characteristics back into the existing 737 envelope by lifting the horizontal stabilizers to the top of the tail, rendering MCAS obsolete?
Would certification heritage from the 727 allow for such a change without demand for recertification?
If so, to what extent?