So do I. I just don't think the portion outside of the disengaged part of the commute would stay the same. Same as every other time car commutes to cities were made easier so more cars came in slowing them back down to the point it's too inconvenient. "If anything this would probably increase car traffic delays as cities would become even more inundated with cars once you got off the highway."

Even tripling car capacity wouldn't oversaturate induced demand which is why I say I'd take high speed rail which can actually oversaturate induced demand due to its speed and density. Or full self driving where there is no portion where you can waste time due to increased congestion.