This is good news. When people see someone they respect taking an action, one they have qualms about, they are more likely to follow. Humans are sheep. Maybe Dershowitz will lead many more away from the Demonrats.
that and also, if more Jews leave the party, even if in the future, they vote 60-40 D/R rather than 70/30, in close House and Senate races, esp. given how Jews are distributed in many swing districts (like NY-03, certain PA and OH ones), it can have a big effect.
I also think Jews’ bleeding hearts for the blacks and Hispanics are stopping as it kinda looks like “we’ve done all we can do. Now stop whining and start behaving.”