Now.... do that with Cab companies. Replace full time employees with "at will" employees. Remove the need for "crap" like 401ks, health and stupid stuff like training and licensing that a "real" cab driver needs. Gee... I wonder why "real" companies can't compete. "real" jobs are replaced by part time employees with a net loss of benefits and safety.
I think you're overestimating the benefits given to traditional cab drivers by taxi companies. Next time you take a taxi, ask the driver how awesome their 401k and health insurance are. And 'training'? Give me a fucking break.