I really think this would be a killer ticket. Biden is arguably the strongest Dem already on his own, and Kamala has so much appeal. There's no way she's not at or near the top of his VP list. The most loyal Democratic voter group is African American women, so the party kind of "owes" it to black women at this point to have one on the ticket. I could also see Kamala the prosecutor destroying Mike Pence in the VP debate. There's also the added benefit of not having to worry about her safe Senate seat.
My only worry is that her prosecutor background combined with Biden's role in crafting the 1994 Crime Bill could cause Trump to outflank them on criminal justice reform. That possibly could diminish turnout among some black voters.
Trump won't outflank them. He wanted the Central Park five killed.