The past and current Escape success is not sustainable if the car will remain at the 2001 level. The Escape sells on relatively lower price and high incentives.
It will die the same way the Taurus did, but this might be part of Ford's strategy.
On the other hand, almost any other car manufacturer completely redesigns a model after 5 years, even the best sellers (Camry, Corolla, Civic, and Accord).
The saying "if it ain't broken, don't fix it" doesn't quite apply to car designs IMO.