I understand your focus here, but I'm not sure how you'd establish consumer confidence. Driving at least comes with a state issued certificate that you are capable of driving the car, and it's a bare minimum requirement. Obviously other factors will come into what makes a good taxi driver, but the bare essentials can be quickly verified.

I'm not sure what equivalent you could have for computer service to provide the same baseline of consumer trust; peek on craigslist and you'll find dozens of computer service postings for even a small town, and in large cities it gets even bigger. I agree that it's probably an area that could benefit from a loosely centralized provider, but adoption seems like it will be very difficult.

I am not sure where you live, but "become a taxi driver in an hour" is not even remotely possible.

You need a TLC license, at least in NY. Insurance, exams and getting a car. Uber in NY requires TLC. Some other states in US are more relaxed.

BestBuy could extend their GeekSquad service by incorporating other vendors into the service line. Half of computer problems require physical touch of the computer. I guess what you wanted to do is to turn SuperUser on stackexchange into a paid subscription, allowing people to pay a few $$ to do remote help, and a platform for people to sell their computer help service.