We aren’t likely to get to China-like smog conditions too soon in major US cities I don’t think? So it’s down to relative costs.. or how the government alters relative costs with incentives, funding or legislation. It would be nice to see storage tech make a leap.. you can only put so many renewables reliably on the grid without traditional reserve spinning to pick up load because we have yet to put in a good, cheap storage system. That could be a game changer but it doesn’t help when the government slashes research funding