I wish I could share your optimism, but the fact of the matter is that American politicians are beholden to their sponsors on both sides of the aisle, and the military industrial complex and American imperialism which Israel is a part of, are both popular initiatives among their primary funding sources.
Meanwhile, most of the voter base (perhaps understandably) cares more about domestic issues than they do about the plight of people on the other side of the world who they are killing and exploiting with their tax dollars.
Given all this, I don't know how you can be so certain that anything will change with a new administration, even with polling demonstrating that voters do disapprove of support for Israel now. Most of the people who disapprove of funding Israel don't care about it strongly enough for it to be a significant factor in their engagement with electoral politics (which for most people is also just limited to voting once every 2 to 4 years)