Nah... This is a no-lose situation for the Democrats. They shouldn't give an inch on this. The CPD (bi-partisan from the ground up) was sat up because the GOP didn't like the League of Women voters. Simply put the GOP wants to play the victim at every turn. Giving in means letting the GOP continue to cry "victim".
What is being ignored, of course, is the situation the GOP will find itself in when their nominee decides to debate Biden anyway. What will the GOP do...tell their members to not vote for their nominee? The man they nominate will have only one shot at this if they lose.... To think that he would decide, "I don't need the free airtime or to put Biden on the defensive" is rather silly.