I’m not so sure about V2G, the power from the batteries will be needed by the grid at peak times, just when people are about to leave for work in their EVs.
Perhaps with the new home working models it may work better, but the current state of home working maybe transitory.
EVs use expensive lithium batteries & I feel that static batteries may suit better, especially flow batteries that use much cheaper chemistries.
Not sure though, we’ll see how things evolve.