As long as it's someone willing to learn from their predecessor's successes it'll be fine. Biden has to be careful not to pick someone whose more conventional views on the subject have now been thoroughly discredited. https://twitter.com/J_Insider/status/1329435007895695360
One thing the Trump team did with regard to Israel was introduce reality, finally, into the equation. Now that that reality has produced unprecedented regional peace progress, if the next ambassador seeks to repeal reality it will not just be ignorant but exceedingly dangerous.
You have to be able to separate out the policy. You have to be able to say 'this worked, this improved things in a volatile region and created a more stable status quo, and we don't want to upset that.'
Think about it this way: overall, the Trump team's response to Covid was quite poor, as I've said and written. But Warp Speed seems to have had a very positive effect. We'll want to say 'what can we learn from Warp Speed' without adopting the bad elements of the response.
Put Israel policy in that light. You don't have to adopt Trump's North Korea diplomacy in order to keep in place a peace process between Israel and Gulf Arab states.