Cougar and Panthers. All the rest were replaced with something newer. Continental -> LS -> Zephyr -> MKZ. Taurus -> Five Hundred -> Taurus. Escort -> Focus.
If you're going that far back than Contour is the most significant passenger sedan that Ford dropped without a successor (at least for 6 years). Taurus really had two successors (Fusion and Five Hundred) but not a direct successor. I also think it's a stretch to say LS was a successor to Continental since it was considerably smaller and was sold alongside it for a period.
So yeah, Ford has a long tumultuous product history of just dropping products and getting back to them MUCH later.
Nothing quite resembles Chrysler just exiting a segment like this, although Ford did it with minivans and small trucks.
Edited by BORG, 13 January 2017 - 01:47 PM.