There is going to be a rush of polling in the next couple of weeks in the run up to the Fox debate so I doubt any of the current polls will be in the RCP average. I know Monmouth has already announced they are doing another one and they just released one last week. Fox is certain to do one right before their own debate. ABC, NBC, Quinni and PPP and Marist are all due for new polls as well. CNN might do one too.
Looks RCP is the 4 most recent and the debate is going by the last 5, right?
I think he'll bleed a lot of his support quickly but still be high or mid single digits. But what about after the debate? I'd say Trump rebounding above his current levels or collapsing below his old levels both seem realistic possibilities. Who knows what crazy thing he'll say and whether it will infuriate conservative voters or endear them to him?