Uber might make sense as a public utility. If it's going to lose money no matter what, why not fund it like public transportation? Lots of taxes on the back end offset by user fees to take some of the sting off and mitigate overuse.
Why would we as a society care if Uber exists enough to socialize the cost of it? I kind of like using Uber, but probably not enough to justify footing the full bill for it (thank you VCs).