How long can Uber keep bleeding cash?

It is becoming increasingly popular to invest in money-bleeding technology giants in preparation of an inflection point in profits, but you have to wonder how long Uber will be able to hold on for.
Uber is a massive brand, an innovator and genuine disruptor to the status quo. There are few examples of a concept riding the wave of digital to create such a severe disturbance to the traditional world. And while Uber might be the biggest transportation brand in the digital era, it is haemorrhaging c