Ford's main goal is increased sales. With the RWD market declining, what ARE the majority of people buying? It seems to be FWD cars with good milage and space, with decent handling.
It wouldn't be a bad idea to pool resources between Ford NA/AU, Volvo and Lincoln to come up with a very credible front drive platform with great engineering, space, handling, and fuel economy that they could use globally.
If they're concerned about performance, there are FWD sedans that can handle, just look at the Mondeo or even the Nissan Maxima; plus if you want increased performance, you can use AWD.
For those who can't do without RWD, by then the Mustang is up for a full redesign. Develope a world class RWD platform for the Mustang and sell it globally. With a choice of fuel efficient turbo V6s and high powered V8s, anyone needing performance can look in that direction.
With that two-tiered approach, you wont bring volume down in the sedan market for those who need performance.
Just my rambling thoughts.