Uber is no cheaper than normal taxis in the UK, so the prices won't be going up by a lot. We already had pretty great, cheap, taxi coverage in the UK.
Not sure where you got that impression.
For me, in the UK, the selling points are that it's easy to use the app, you don't have to muck around with cash and the cars, at the moment, are new.
Oh, and that I can abuse the fact that I'm relatively rich compared to the plebs to jump the queue with surge pricing. Very un-british of me.