He could do it via streaming video and no one would have to pay any attention. Heck, as detached as he is (I didn't know anything about it until I read it in the paper), Congress probably knows more about the state of the Union than he does.If Congress had any balls they'd disinvite him and say send us a copy in the mail.
It's a constitutional requirement that he report the state of the nation to the Congress every year.