The original comment referred to price gouging due to lack of competition. VC money might subsidize the rides (or more likely find ongoing development?), but Uber and Lyft are bound to be cheaper than taxis for as long as they can remain less entangled with governments (less artificial price inflation).
The problem is that Uber loses money on every ride, so they'll have to raise their rates as soon as they stop being subsidized by VCs -- unless they have self-driving taxis by then.
Or they stop investing so heavily in platform development. Without detailed knowledge of their accounts it's hard to predict what might happen when capital shrinks.