The answer is not to go back to basic stick and rudder flying. The answer is to have more redundancy in the inputs, and not allow the computers to be disconnected. (Just, as you would not dream of disconnecting the flight control hydraulics.)
Moving from 3 pitots to 17 would not help much as they have to be in the same aspect to the air stream as each other to provide comparable results and would likely all freeze up or not. Then you have the problem of what to do when x agree and y show different numbers to the x and each other etc. Problem is that near coffin corner you need one RIGHT answer. Any sort of mean value or even a most probable value is bound to be WRONG to an unknown lesser or greater degree.
The computers are not disconnected on UAS. The AP may "disconnect" itself, some protection subroutines which depend on IAS may decline to function (and announce that fact) but the computers still move the control surfaces - unless they all fail and then you have Mechanical Law and you really are in some trouble whether in a Bus or a 787.