Joe is a decent guy. I know that's an alien concept to some here, but after watching him run some cabinet appointments, he's a real professional. He is NOT Obama. He might could have beaten Trump in 2016, certainly would have done better than Hillary. I doubt he can in 2020.
Plus, let's be real...Joe IS the swamp. He's been in Washington forever!
I suspect voters will be looking for experience in 2020. Trump has refilled the swamp with his creatures.