I agree it is silly to forever be refering to any of the former Beatles as former Beatles, but as George always said, they will always be refered to in that way.
Actually, Paul probably doesn't care. That's my opinion. I think if we could could open him up and see his soul it would read: Beatle Paul.
Paul never wanted to stop being Beatle Paul, after all. The breakup of the Beatles broke his heart.
When Paul goes on tour, he is giving the old fans like me what we want: The Beatles (as close as he can manage, anyway). Which is not to say I don't love Wings and his solo work too. I do.