My proposal is:

6A: the top 40 schools
5A: the next 40 schools
4A: the next 48 schools
321A: remains unchanged, stays as it is

Basically, it moves the top 8 5A schools to 6A. Then the top 16 4A schools to 5A.

Of all the proposals I have heard, this is the one I would like to see presented & pushed for.