An honest answer: It would likely increase the progressive voter turnout, but I am unsure about the net effect. I would certainly hope it increases total overall turnout, but unfortunately a large chunk of the voting populace--including a lot of reliable Democrat voters--are still very much pro-Israel.
That said, I would also like to confirm: Assume for the moment that Biden and Trump wins the nomination, and there is no change in the status quo between now and November (this is unlikely, given Biden's recent shifts in policy signaling a possible change in trend, but I want to check against the worst case scenario). Would you still vote for Biden, or would you stay home? Would you staying home potentially affect the outcome (I.e. are you in a solid red/blue state like Alabama or California, or are you in a swing state like Michigan or Georgia)? What would need to change for you to vote for Biden in November?
Make no mistake, this may seem reasonable on the surface, but it's a Trojan horse that anti-choice extremists are hoping to leverage so they can get another case in front of our extremist supreme court to argue that fetuses should get full protection under the 14th amendment, resulting in a full nationwide abortion ban. NPR recently released an article about this: How states giving rights to fetuses could set up a national case on abortion