Personally I think that trim runaways happens so rarely, that once it's eliminated that MCAS can't trim full nose down anymore, I would not be to worried anymore to get on a MAX plane.
MCAS is not runaway stab. MCAS kicks in under certain conditions, MCAS was a solution for those conditions, and those conditions remain to be dealt with.
Currently, the ac has 2 sensors, one of which is used for STS and MCAS. The results a faulty or damaged AoA sensor initiated MCAS.
On the NG, the stab switches could cutoff AP and Elec stab control separately. Currently, the MAX stab switches cut off the electric stab control entirely, leaving the crew to manually trim the aircraft.
Given that it appears that in both cases, the AoA was damaged, it looks like the crew will be manually trimming the ac for the rest of the flight. That is not realistic.
Adding an AoA disagree light, so what? Changing the switches back to NG config...okay, then again, if one AoA is gone or damaged....
Adding a 3rd AoA vane, damn near impossible.
The underlying reasons and conditions MCAS was added in first place.
While it doesnt happen that often (until MCAS) when it did, it exposed the issues with the MAX AND the NG...
The "roller coaster" hasnt been in the manual since the -200 with a different stab/elev config.
Extending flying on manual trim with no AoA or limited, yet another lost art?
All adds up to a real big mess that a "software fix" is but a small part.