GM and Uber could force Tesla to do something it isn't ready for (tsla)

Last week while in Norway, Tesla CEO Elon Musk stoked some rumors about a new business the electric-car maker might dive into: urban ride-hailing.
For what it's worth, Tesla is already in three businesses: automobiles, batteries (it's building a massive battery factory in Nevada), and energy storage, through its Tesla Energy unit. So hey, why not bring on one more?
The problem is that Musk probably isn't all that thrilled to be pushing Tesla in a ride-hailing direction, for a variety of rea