Re: If the software hasn't been changed to use redundant sensors
Right now it is fixed within the parameters of the possible. Short of implementing synthetic airspeed and AoA (as EASA has requested), the only other option is to do what they've done, which is "if AoA sensors disagree, disable MCAS".
Installing a third AoA sensor would be... interesting to see where you'd put it, plus all the other fun that goes along with that (don't misunderstand me, I'd very much prefer an odd number of physical sensors on a fuselage).
Biting the hand that feeds IT
