Uncertainty and weather extremes are predictions from global warming, as a broad brush of what is likely. But thinking that noticeable pushes of migration on Mt. Davidson could disappear in the coming years is probably farfetched. It is equally likely that migration pushes will become more common given how little we know, and how broad the climate change predictions are.
On the other hand, we have just finished one of the most abnormal and unusual three or so years here in California with the mix of the warm water blob and the drought, which are related from what the science is telling us. Yet, other than in the seabirds the signal of what happened on land to birds is unclear to me. Perhaps the most noticeable thing to me locally was Rufous Hummingbirds migrating en masse along the coast in spring due to lower flower abundance inland I suppose.
But it opens the questions - what did we notice in the post 2013 odd years with respect to land birds? In the ocean the signal was clear, perhaps highlighted by the Blue-footed Booby and later Brown Booby movements into our area.