I'm sure there's a lot of computer control in most modern helicopters already, but this would have to be entirely computer controlled to be at all flyable. That would open up a new can of worms when it comes to safety. I know that "fly-by-wire" is popular these days, but personally I only consider it "safe" as long as everybody is equipped with ejection seats.
I don’t accept your first premise - an electrically driven tail rotor, (whether feasible or not), could still be manually controlled.
As to fly-by-wire; so I take it that you don’t fly on any Airbus and only on some Boeings and turbo-props?
Airbus 320 family and 330 each have 5 FBW computers, and can remain flying aloft without any of them.
PS: can helicopters have ejection seats ??