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'm not sure what equivalent you could have for computer service to provide the same baseline of consumer trust"
Have you heard of IT certifications?, each vendor provides certifications based of their technologies, Microsoft has a lot of different certification programs.
If the client only wants to know the basic usage of a program, the service could pair it with another person not certified. If it's a company requiring for help or a developer in their home, he could request for "advanced service" and then a certified person could help in the specific field of the problem.
You can have a reputation system, with badges that determine how the person has being helpful, reviews from the clients etc.
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.