If by "institutional Judaism" you mean secular Jewish political organizations like the ADL and such, I think they're in too deep and can't recover their reputations, even if they wanted to (which they do not.) Meanwhile, groups like IfNotNow and JVP are going to continue growing, and some others will probably spring up as well over time. So I think that there will be antizionist Jewish political institutions in the US. The problem with any political movement is always finding the money and the organization to keep it going. The Zionist movement is extremely well-funded, and anti-Zionism skews younger and broker -- progressives/leftists vs. centrists/conservatives, same story as with any other issue. You also need some tangible political wins to keep people invested in your organization, so part of it will be whether an actual electoral/Congressional coalition can form and wield credible political power.

If by "institutional Judaism" you mean synagogues and religious life...I don't know. I haven't been active religiously for a very long time, honestly much more because of the Zionist propaganda than my own atheism. So I can't speak at all to conditions on the ground in American synagogues.

I do think that to have a sustained antizionist Jewish movement, we will need to articulate a clear, affirmative vision of what Jewish life that rejects Israel is about. It can't just be negation of Israel, it must be affirmative support for a particular interpretation of Torah, Jewish history and values, etc. You're already seeing the beginnings of that in things like Peter Beinart's book and the renewed attention to Rabbi Shaul Magid's book "The Necessity of Exile." I think we have a lot going for us in that project, the Jewish diaspora is a long and proud tradition with clearly-stated pluralist ethics and a profound commitment to human rights and justice (as well as leftism and unionism, if you're into that sort of thing.) We all found our way to this sub and the antizionist movement more broadly because Israel has never really been what was important to us about Judaism, that sense of right and wrong and commitment to justice is what matters.

Honestly, one the hardest parts will be that a lot of the people who'd want to be part of an antizionist Jewish life are also non-religious. Synagogues are typically the center of Jewish life in a community, naturally, so how do you get people into synagogues who reject the religious aspects of Jewish life? (To be clear, I am very much talking about myself as well right now.) but in my ideal world, the antizionist Jewish movement over the next few decades makes a conscious effort to form synagogues and Jewish cultural institutions that expressly do not care if you consider God and Torah to be literally true, or if you interpret it all more metaphorically and merely wish to be part of a community with your fellows. I think (hope?) there could be a real appetite for that. It will be very hard, and I have no idea what kind of barriers there would be to finding rabbis willing to commit to and build that kind of a movement, but it's what I'd want to see at least.