> In particular, I think PHEVs should be an regulated requirement for all consumer (and probably semis, why aren't they hybrids yet just so they can have better acceleration/torque and regen braking) vehicles in ten years, with a 10-year decreasing subsidy for PHEV and a 10-year increasing penalty for car registration and new car purchases of pure ICE.

That's the actual plan for Europe. They are planning to start ICE phase-out by 2035, with only limited exceptions where it's impractical (like long-haul cargo or specialized machinery).

I actually don't think that the hybrid timeline could have been accelerated significantly. A lot of foundational technology, such as compact power electronics became accessible only by the early 2000s. Lithium batteries also became commercially viable by then.