Totally agree with you on the first part. In fact, one thing that you did not mention is that these plug-in hybrids, along with low MPC EVs, the owners will plug these in esp. in the daytime. IOW, they will drive to their job in the AM and then plug-in and charge all day.
Now, numerous studies have been done on the impact of electric cars on the electricity demand and grid. Basically, we have plenty of energy and generally, the grid is fine, EXCEPT for the NW. BUT, that was all predicated on less than 25% of the cars charging in the daytime. In addition, the studies noted that if more than 5-10% of the vehicles charge in the daytime, it will INCREASE the price of electricity for all of us due to increased daytime demand. Between your statement, along with these studies, that is why I oppose cars like the leaf and volt. BTW, the bolt is PERFECT. 200 MPC is right around the correct amount as it allows the cells to be rotated, so that the batteries last a long time (10-15 years), and will cover 99.9% of all American driving.
I differ with you about how long it will take us to move to electric. The only reasons why these car companies, including GM, are doing Electric, is due to Tesla. In 3 more years, when Tesla introduces gen 3, like the Model S, they will not be able to make enough of them to satisfy demand. The reason is that when it comes out, the entire west will be covered with free SuperChargers. OTOH, Fuel cells cars will be pushed by most of the major car makers, but it be over $5/gal equivalence to fill these cars. The operating costs, combined with the fact that the cars will be more expensive than even a EV car is, will make car buyers DEMAND EVs.
By 2020, car makers will have announced that more than 1/2 of their vehicles will be pure EVs. In addition, I suspect that they will take advantage of Tesla's SC, though they may choose to standardize on something else.