javadud

I have a 2008 Edge with 140,000 miles. Rear wheel bearings went bad around 55,000. They said it was a design flaw and I got everything rebuilt under warranty. No other trouble. Would like to buy a mustang next year and keep the Edge for the winter time. Hoping to get 250,000 miles out of it. Do you think I am insane to hope for that many miles?