Not a pilot yet myself, but I know exactly enough about flight physics and control to suspect that while you are likely correct about the MCAS jack-screw positioning being undesired, the solution is probably not to auto-return it to neutral.

If we assume MCAS is only disabled in an emergency, we don't want the result of cutting out an automated system to be further automatic manipulation of the control surfaces, right? That's one more weird behavior for the pilots to have to keep in their situational awareness while doing the most important step (i.e. flying the plane).