This isn’t super surprising; I’m honestly impressed they managed to keep a client alive in the Linux ecosystem for as long as they did. That said, found something in the comments from Flex developer Matthew Fabb regarding the 64-bit Flash debacle:
Adobe has committed to getting a 64-bit version of Flash out with Flash Player 11. My understanding is that it is a technical issue, as Flash uses licensed code and codex that have not been available in 64-bit.
We know from painful experience that letting a third party layer of software come between the platform and the developer ultimately results in sub-standard apps and hinders the enhancement and progress of the platform. If developers grow dependent on third party development libraries and tools, they can only take advantage of platform enhancements if and when the third party chooses to adopt the new features.
Sounds like Adobe could stand to take a page out of Apple’s book.