I reject the use of the word 'ditching'. I, and several others, knew from the first day that Obama was not going to cooperate with the Trump transition. Obama is a liar. He is the King of Liars. We knew that he would do whatever he could to disrupt Trump regardless of anything he says. That is just who and what he is.
Obama is an arrogant and petulant child. It is naïve in the extreme to expect him to behave in a mature adult manner after not getting what he wanted in the election.
However, the thing is, Trump doesn't give one damn about Obama. So there is not really anything Obama can do that would frustrate Trump. All Trump wants from Obama is for him to pack up his shit, and get the hell out. That is pretty much the extent of Obama's participation in the transition.