We aren't going back to the 60s, but mass-market RWD sedans are here to stay, like it or not. They always have been, really -- how many cars did BMW sell in the US last year?
LX sales are down a bit because the Charger and 300 need a refresh, which is the problem with using trendy buzz designs, and because the Magnum has pretty much run its course as a product. Challenger will add some units, and there's a Chrysler coupe and a bigger sedan in the works too.
Also, the Hemis need a redesign to get better MPG, which is coming in about a year.
Meanwhile, GM is investing zillions to produce new line of RWD cars for North America -- next-gen Impala, Camaro, G8, GTO, next-gen Lucerne, next-gen DTS. Like Chrysler, they'll offer both front- and rear-drive cars, seeing that there's a solid market for both.