It's a phasing out and not a ban starting from tomorrow. Unless companies are forced they'll do nothing.
I know, and I agree that emissions should be lower- I haven't been impressed by most automaker's results after so many agreements to do something about it. They use 'C.A.F.E. standards (Corporate Average Fuel Economy) to show that they're doing good things, but some vehicles are no better than 15-20 years ago, if not more. I had a car which was made in 1992 and its fuel economy was in the 29 MPG range on the freeway, about 22 MPG in city driving. That would be about average now, but it was pretty good, considering it wasn't a small car.
People in the US, especially, need to lose the idea that they 'need' big SUVs, pickup trucks and other vehicles that gulp fuel. They carry children, not building supplies. They believe that they're safer if a crash occurs because of the extra weight and far too many drive these gas hogs while they're alone. Sure, it's nice for someone to be able to drive what they want, but it's not really necessary.
But hey, this is America, where 'bigger is better', right?