I read all 350+ pages of the proposed rule changes...and remember about 3%.
Having said that... (and if IIRC), the MOSAIC rules will allow the use of any TWO of the combination of controls of a complex aircraft with proper endorsements at a time. You as a pilot can be signed off for flaps, variable prop, and retractable landing gear, but you cannot fly an aircraft with all three simultaneously under the proposed MOSAIC rules. Since the Mooney has all three, it shouldn't be eligible. This would eliminate a lot of complex aircraft.
That's how I read it. Looks like the end of discussion for Mooney's being eligible for light sport regardless of the stall speed.