This is what I believe is going to be the case as well. Disney has usually marched in line with the CDC directives. They said in July that "if you live in an area of high transmission you should mask indoors regardless of your vaccination status." High levels of transmission are defined by a rolling positivity rate of over 10%. As it stands today, Orange Co has fallen below that. Disney hasn't moved their indoor mask requirement.
I really feel like they'll leave it in place at least through the Holidays. Simply because they may have to bring it back in the winter IF things go south again. IF we can get through the Christmas Holidays without a major surge, as we get into late Feb/early March and Covid numbers have fallen even further or plateaued out, the I believe Disney will drop the mask mandate for a good long while. I don't think they want to bring them back, drop them a few months later, then bring them back again. I think once they drop them they want to have them gone for a good long while.
But then again I have NO way of knowing the metrics Disney uses to decisions off of. I wish I did.