If Adobe was really upset with how Apple is conducting themselves, maybe they'll start dropping support (or seriously delaying it) for their products on Apple platforms. Granted it could backfire and cause webmasters to rewrite their sites to drop flash, but think about the other programs? Other than switching to MS, to get apps like Photoshop or CS, what would Mac users do? Anyone arguing that alternate apps exist that do just as good of a job, why haven't they run Photoshop a run for their money? I'm looking at GIMP as an example.
What would be the backlash if after the next OS X/Safari update, Adobe announced no more Mac support for PDF, Flash, Photoshop, CS, etc... Throw in the mobile support for flash that is supposed to be coming to most other big name non-Apple mobile devices this year, they can try to hurt Apple where it would hurt the most, their users.
But like I said, it could completely backfire, and Adobe might come back with their tail between their legs and ask Steve Jobs for forgiveness.