I agree uber drivers =/= black cab drivers, but I'd also argue that most people don't want or need a black cab driver today.
What extra services does a black cab driver provide over an Uber driver in London?
- Better knowledge of traffic patterns?
- Ability to recommend places, give you local knowledge
That's all I can really think of. I agree that local knowledge is sometimes useful, but the vast majority of the time I know exactly where I want to go, and if I'm looking for recommendations I'm likely to trust the internet more than a taxi driver.