The evolving resolution of NK and Iran will be well underway by then. Full disclosure then strengthens his hand at dealing with our friends whose interests do not obviously coincide with ours. China's enthusiasm from the military needs to be understood as hollow by all. That is why that rail yard in Northern China was flash-banged a few months back.
A few flights of obvious small UFOs and a fleet of gravity bombardment ships might just do that.
There is also another pressing reason for disclosure now or soon. Crews created in the 80's are now aging out and it is becoming impractical to eliminate memories for the numbers now coming out of the program. No one thought that it would be kept a secret so long.