I can't help disagreeing with M(F)S just a little bit.
Whilst it's true enough that stalling AoA, and by relation the preferred AoA for approach, manoeuvre entry, etc. is affected by altitude, configuration and so-on, it should be less affected than airspeed since for a start weight and g are removed from the equation. PEC also shouldn't be as big an issue one might hope.
So, it should for most aeroplane types be possible to schedule (for example) a single approach I_alpha per configuration which may lead to significant simplification of operating limitations and advice.
It'll never replace airspeed - Vne and VMC for example are inavoidably functions of EAS, but it might help make life a little simpler and easier.
Maybe.
It would certainly be an interesting thing to look at seriously in regard to an example aeroplane for which both IAS and I_AoA correction and operating data are available.
G