As Tesla sells more cars, letting others use their charging network might negatively impact their owners experience. Anything's possible, but I'm not counting on it. FWIW, they are generally spaced for Tesla range rather than something like the i3's. Plus, at least those sold in the USA, being limited to 50Kw/hr would mean they would stay on one possibly longer than a Tesla, depending on the battery pack in the Tesla...making their wait time on a busy station maybe worse.
The real answer, IMHO, is to get some more support from the government to make them easier to install. Car manufacturers are spending some money on this, but until the demand increases, it's the chicken or the egg controversy...do you add charging stations to boost demand for cars, or do we have to have more cars, and thus demand, to then build more charging stations. Private industry won't do it unless they see an advantage to their bottom line, but government can have an effect by adjusting the costs as an incentive. Some is out there, more is probably needed. The end results of the VW law suit will take another couple of years to be fully implemented, and that will help along with other manufacturers stepping up to the plate to make their vehicles more desirable. Still, the vast majority of people charge at home. IMHO, there's still a place for an ICE, but the window is getting smaller. A good hybrid will likely be my next vehicle.
2011 535i x-drive GT, 2014 i3 BEV