Based on last night's performance of the State of the Union, I have to think that there is a real possibility we have seen the last televised State of the Union (SOTU) before a joint session of Congress when the House of Representatives is controlled by the party opposite the White House.
In other words: another norm broken.
First, some historical & constitutional perspectives about States of the Union.
Article II, Section 3, Clause 3 states “He [the President] shall from time to time give to the Congress Information of the State of the Union, and recommend to their Consideration such Measures as he shall judge necessary and expedient...”
This is the constitutional foundation of the SOTU. Notice there's nothing said about how the "Information on the State of the Union" shall be given. And it's "from time to time"--nothing constitutionally specific there either.