Many of the "dead" vehicles are nearing the end of their tooling's lifespan. Time for something new and better, as things go.
The Chevy Impala is tied to a Cadillac model which has been known to be going away for a rew years. Which also meant the Impala was over-priced for a Chevrolet sedan, as the prior SS also was. The Malibu and Impala are too close in size and base price for both to do well.
The main market for the Ford Taurus was the fleet/police market, it seems. In its earlier life, it was not a bad car, just one that was more geared to retirees, with all due respect. Nothing exciting or interesting, from what I saw. This is the same car that started life as the Ford 500. Ford couldn't or didn't know how to market it as a family car, as the prior Galaxie 500s were. Going back to the Taurus name (better name recognition with the younger people who grew up with an earlier Taurus in the family), it was claimed, so sales of the SAME car/different name increased. For a while.
As for Chrysler, the LH/LX/LD plant needs ALL of its product lines to remain profitable. Chryslers haven't been really promoted in many years, but still apparently sell decently well for no promotions. Charger sales are where the recognition is. Check resale values of a 300 and similar Charger. The Charger is higher! Which makes the off-lease Chrysler a more affordable car for many that look for one (which might include ME in a year or so). Everybody keys on Dodge, rather than Chrysler, these days.
More Chryslesr upscale models? Not a good idea. Even as weak as the Cadillac car lines might be, or how competitive a similar Chrysler model might be, it hasn't worked before and would probably not work this time, either. To me, that last Imperial concept was a poor excuse for what it was. It did have some neat heritage styling/design cues, but they just didn't work well together, to me. Didn't help when a few of the LEDs in the tail lights didn't light up when it was at the Dallas new car show!
Most USA brands have exited the small sedan marketplace. It's the domain of the import brands, it seems. So rather than play their game, the domestics went to what they know how to do . . . truck chassis based SUVs, pickup trucks, and larger FWD utility vehicles. Some of which the FCA brands are not really competitive in (as the Journey and some smaller Jeeps), to me.
To me, one reason the domestic small sedans didn't work was their lack of utility functions. The upper body contours don't work too well for utility purposes. But even when those cars did have more utility functions, nobody really noticed. We are in the Time of Home Depot where a pickup truck is needed to buy home improvement items that are 8' long and/or bulky. Or landscaping things that come on pallets. At least that's what I see when I go to Home Depot . . . pickup trucks, fancy ones too.
I suspect the small Ford fwd sedans will return as "city cars" that are hybrids or full electric. Until a larger network of charging stations occurs outside of the major metro areas, full electrics might always be "iffy" as to general use, I suspect. Hybrids will go anywhere, though.
Volvo has already committed to all of their new platforms being hybrid or full electric. Look at the electric Bimmers! Volvo seems to be positioning itself as the "Swedish Buick", in styling and orientation of their base consumer demographics, it seems. And that brand could also siphon sales from the Chrysler brand, too! A full line of sizes, too. Sedans, SUVs, and one SLEEK coupe! Not the same Volvo that brought us the 164 wagon!
Current Chryslers might be "dated", but they are still dang nice cars. A shame they don't get the respect or sales exposure the "Burnout King" Dodges tend to. AND do it at a reasonable price well south of the $100K Cadillacs and Lincolns.
The last two Charger R/Ts I rented for weekend trips averaged 30mpg on the highway at 70mph cruise. Generally flat ground Interstates. The 3.6L V-6 is a bit better. If the aero numbers on the 300 are similar to the Charger, it should do similar, but I also suspect the lower EPA highway "estimate" can scare some potential buyers off.
SO, let's root for the Chrysler 300s as the Dodge Bros get to have all of that fun making tire smoke.
CBODY67