For large apartment complexes there will probably need to be some load balancing, but seems manageable. Power going out doesn't seem like that big of a deal, more likely to have some charge in the car and it's more likely to find power than gas in a crisis (long lines at gas stations etc.)

Long trips by car via super charger are pretty easy for everything except 700+mi trips which are very rare for vast majority. Unlikely to shift anything to air travel, if anything lower EV fuel costs could shift other direction.

For snow my parents have had only EVs in Buffalo and have been fine. They also drive down the east coast to Florida.