DEW was a mistake, even if it was a great platform. It was too expensive for Lincoln and Ford, which is why they're looking at other options for their new large cars (either Volvo or Panther derived), yet it was too cheap for Jag' (which is why the S-type is moving to the XJ platform and the next-gen X-type is getting a revised smaller DEW).
Any North American large car platform, for starters, needs to be engineered to accept Ford's mod' v8s, not the much more expensive Jag' v8!
If was was picking a platform for the new large Lincolns I wouldn't know which way to go: Panthers's BoF flexability, DEWs suspension and refined ride, and P2 (Volvo's) AWD and safety are all appealing. That's why last I heard an AWD, IRS equiped, Panther-derived platform was the leading contender.