Except Trump won't be President forever. I can't see how Israel can maintain the perception of being a democratic bastion if it makes a West Bank state unviable unless it integrates the whole West Bank, but if does that then the non-Haredi Jews will be a minority. If that happens, it's difficult to see how Israel can remain a democratic secular Jewish state.
Again, I'm so sure what the issue is. The Israeli populace doesn't seem to care about public perception or remaining secular. And even without Trump, I'd be hard pressed to single out a current top-tier dem nominee(maybe Sanders) who would actually hold Israel accountable.
I wasn't trying to imply that Israel is facing any short-term risks even with Bibi. However, on Israel's current course, I can easily see the US going from a supporter of Israel on a bipartisan basis (with the only real disagreement on how best to support Israel) to a country some decades from now where neither party gives a fig what happens in the area. Once that happens I can't see Israel maintaining military superiority over its neighbors. Bibi's fundamental flaw is that he acts as if the present situation is permanent. He doesn't act in a manner that suggests he considers what might go wrong.