We can actually learn some things from bias pollsters that lean pretty heavily to the right.
OH poll out today from Trafalger - has Trump +4. This pollster has a house effect of 5points right. So this is actually closer to a Biden +1
They had WI at Trump +1 back in late August, and their last poll spanning over the debate date, was Biden +3. Four points off the average, but still show a sizable shift.
Rasmussen who does a daily presidential approval number (and the only pollster other than Zogby, to ever show him above water) - Had Trump at Plus 2 to plus 7 from September 14th through September 26th. After the debate, it went down to Trump -3 to -7, up til today.
So even the bias pollsters are showing a shift towards Biden. The shift is real, and I don't know what Trump could do at this point to change that trajectory. He could do more to make it worse. But I don't see that someone with his psychological problems, can make it better.
There still could be another October surprise. But RGB didn't change anything for him, Covid diagnosis brought no empathy bump, policeman shot at a protest didn't change anything, debate didn't change anything. In fact a couple of these things made it worse for him. I don't see the VP debate bringing anything but more pain. And Pence and DJ and Eric doing rallies... yeah.