Surely Ford could take the existing chassis, and replace the bodypanels with those from a Taurus? If Volvo can use an engine they haven't sold for 3 years, Ford need not even change the engine, although they could always switch to a Mustang block if they felt it necessary. Unless they specifically /wanted/ to retire, this would seem like a sensible option...

Of course, with the Falcon gone and the racing Taurus being just as dissimilar to the roadgoing variants as the other new entrants, there would only be Holden in the way of V8SC converging with DTM, JGTC and the Grand-Am series. And that depends on exactly what they do after the VF. If it's Epsilon-II based (think current Chevy Impala), then they'd probably be open to a convergence. If they go Alpha, and particularly if there's a V8 in the range still, they'll fight to keep the series separate...