Subject: Re: EV's in CA will *charge* the grid
Also, wouldn't that additional non-transportation discharge into the grid amount to extra wear and tear on the battery thus requiring replacement sooner than if used solely for transportation?

Indeed it does!
Not to mention all the losses from moving all the power around due to voltage conversion efficiencies + transmission line losses. They'll lose a ton of energy just shifting stuff around.

Until and unless solid state batteries hit the market (some are coming online), I won't touch an EV with a 10 foot pole.