i think because of the success associated with the brand, it should remain as Pride FC no matter who has bought it.
If Pride has been bought by the UFC, I think the Pride name will eventually go bye bye.
Whenever you see two companies merge, the powers that be always say that there won't be any job cuts and that things will remain the same, but after awhile, they realize that they don't need two HR departments, two marketing depts, two Payroll depts etc.
In addition, with the exception of hardcore MMA fans, the American audience isn't very familiar with the Pride product, as opposed to the UFC. So, if you were the Ferititta's, would you want Fedor fighting under the Pride name, or UFC?