GM and Ford finally got the right idea. Bring us the well engineered stuff you sell in Europe instead of the junk you think we want.
Saturn was doing that for GM, with the Astra being pretty much a straight rebadge of the Opel Astra, and the Aura a slightly tweeked version of the Opel Insignia. Here is the 2010 Insignia, and thus what a new Aura would have looked like:

You can still get the car, as the new Buick Regal though.

4 cylinder only engine lineup, including the GM 2.0 turbo with 260 hp and perhaps a hottened up model called the GS. GNX reborn?