While Tesla and other Musk companies are currently over-selling the capabilities of their products, I personally think they will succeed longterm. If you extrapolate the rate of improvement in in the battery and solar tech you can easily see the benefits.

At some point the cost of producing power with solar will be less than the cost of transmitting electricity in the conventional grid.

Imagine when the efficiency of EV are 50% better than today, power is 50% cheaper and the required maintenence is zero (close to).

Maybe it won't be Musk, but hes sure onto something.