Disregarding that dog whistle:

The support is weakening due to the choices of the Israeli government; they disregard this at their peril.

Many of the Israeli citizens protesting against Netenyahu make this exact point.

You mean, Jews' support of Israel is weakening? How is that possible? They understand that not having their own state they will be back to pariah status worldwide even if simply for not having a place where they can surely go if threatened.

No, I'm not saying that. What is weakening is:

1) *The global geopolitical support that Israel requires to continue to exist because Israel is not a superpower able to stride the world alone*.

2) *The Netanyahu government itself*, which is unpopular within Israel and many Israelis consider incompetent and/or corrupt; the domestic protests against him personally and his government include many people who know about #1 and don't like it and are loud about this.