What You Talkin' About, Willis Tower?

Chicago's Sears Tower will be renamed this summer for a soon to be major tenant, Willis Group Holdings (catchy name). They are a British insurance broker. I understand the concept of change. Things change. It's life, it's evolution. But wouldn't it be nice if an American architectural icon were renamed after, oh, I don't know, an American company? Just asking. Of course, maybe there aren't any American companies still in business.