Extremely unlikely because it doesn't align with the financial incentives of the power companies to improve infra to support mass V2G when those batteries are not guaranteed to be available in the first place

From my view: Uncertain. It's currently more of a "we would like to explore X" rather than a "we will depend on X". It's actually simpler to just pay for and build the more industrial scale battery installations, even considering the difficulties of financing, real estate, construction, regulations, etc. But I just work for one big company, maybe someone else is taking it much more seriously.

Personally I'm still not sure how the hell all the apartments and cities in the world are going to both install enough chargers and solve subscription charging when almost all the charger companies have absolute dogshit hardware on 3+ year old obsolete charging standards. Their software is so bad I can't believe someone was paid to write it. So, yeah, V2G? Let's get reliable managed chargers everywhere first and then think about the grid

One issue with this is that at we have peaks in demand for electricity exactly when cars are more likely to be on the roads (morning and evening commute times, roughly).

So for it to happen at large scale, we would need to see significant reductions in eg night time generation capacity. In my view this is unlikely (nuclear and wind will still run at night even if we close every coal, oil and gas fired generator).