As a Londoner I dispute that claim. It's made a huge difference for a lot of people. Until the night tube's arrival last year getting home from late nights out was expensive, difficult, or impossible. It's quite useful when moving flat - something younger Londoners tend to do quite a lot. I had to go somewhere with some heavy equipment last week and if it weren't for Uber I would have spent a fortune on taxi's. When I was ill for several months which prevented me taking the tube I used Uber to get to/from work. It was expensive but affordable. Taxi's would have been too expensive and I would have been screwed.
Finally - I received half a dozen messages from friends within minutes of the news being announced. Looks like it will be missed.