I think throwaw181ay is making a different argument, which is essentially that you should license the people (e.g. like a driver's license, which indicates proficiency) and not the thing, which is (basically) the car.
As the parent notes, in certain setups (like cap and trade) the tradeability of the license is important for ensuring that the restricted resource is used efficiently: the most economical emitters of carbon get the rights, and the most economical drivers get the medallions.
The whole point of this is to ensure that the price for taxi rides is higher than what the market-clearing price would be. In other words, it's a scam to rip off gthe consumer.
(Similar arguments apply to zoning regulations and house prices, of course)
You might as well dismiss all cap-and-trade proposals as being "just another scheme to raise energy prices".