^^^ "Eventually it will be absolutely possbile, and other people are already doing it [...] to be able to run their house completely from their car."
I find that statement highly misleading. You'll be able to use your EV and an auxiliary battery, but an EV doesn't generate electricity, so you can't "run your house completely from it".
The other question is, do you really want to do that? Current Li-ion batteries do degrade as they are cycled. Do you really want to put more cycles than necessary on you EV's battery? I'd want to do a cost/benefit analysis on that before I'd make my EV's battery available to help balance supply and demand on the grid.