Not very fast though. The strong approval drop is what is leading the negative numbers. I’ve been watching his index daily for about 3 weeks now. His approval has dropped noticeably more than his disapproval has increased, although both numbers are moving in the right direction.
We can not really expect, nor do we need, his strongly disapprove numbers to get much higher than 40%. At one time Hillary's negatives got to 44% and she is the she-devil incarnate. Now that we have reached a -8 or so the strongly disapprove wont go much higher. The number to watch is the strongly approve as his base become disenchanted, and the overall approval/disapproval rating as the middle becomes grumpy.
There is no way to spin these numbers in a good light. I haven't even heard them trying.