Obviously there are a lot of other companies trying to do the same thing. And none of those companies will be able to compete with Tesla's pricing on the batter

Obviously there are a lot of other companies trying to do the same thing. And none of those companies will be able to compete with Tesla's pricing on the battery side as soon as the Gigafactory is fully online. They will be producing a very, very large proportion of the world's battery capacity and have the scale to bring costs down way below what anyone else is capable of for some years yet. There is risk there of not being able to meet demand between panel installs and model 3 orders, but I think that's a good problem to have. The panel side of SolarCity is a little less impressive, but the Silveo 360w panels are looking to be very competitive with other offerings in that range on price, though they will probably have lower absolute efficiency relative to the next-best offering that I know about from SunPower, and a large increase over most currently installed panel's wattage.