Yes, they probably had to keep the Cup and Busch as long as Busch was a sponsor. But now the Nextel / Sprint are one.
The Big Question is will they have a Nextel Victory Lap for the Champions for them too????
From personal experience with nextelcup.com, I can tell him that he'll be receiving a letter from a large law firm in the mail if he hasn't already received one. Back when I locked down nextelcup.com, I also locked down sprintcup.com because it was one of the possibilities mentioned along with visacup, mcdonaldscup and earnhardtcup.