What would qualify as a turn around? If three years from now they are a $50 million company that's profitable, would that work?
Truth is - now that they are public ~ I'm not sure what success is... for a lot of people who started there a long time ago - the IPO was 'the success' now the public is left holding the bag (mostly by their own choice of buying the stock).
I think Uber can exist, I just don't see how what they do is worth billions. When Uber withdrew from Austin, it took a couple of days for very similar replacements to pop up.