The one thing that I found positive about Colombian taxis is that they are very cheap. In this regard, I don't see how Uber could compete.
On the other hand, the cars are falling to bits and the drivers are rather aggressive (although it seemed to me that drivers were careless in general).
I would pay a premium for the feeling of increased safety. If Uber had better cars and drivers it would be worth it for some people to pay the higher price as the stress of a bad driver at the wheel is horrible. The constant feeling of "will this next corner be my death?" No thank you.
On the other hand, the cars are falling to bits and the drivers are rather aggressive (although it seemed to me that drivers were careless in general).