Weird, I always looked at Adobe destroying the Macromedia culture, not the other way round?
Look at the Flash Player Timeline http://en.wikipedia.org/wiki/Adobe_Flash_Player the advances through versions 5 to 8 are spaced 18 months apart and are quite major.
Once Adobe took over they shortly upgraded the VM, but the next major release (10) took over 2 years. This was almost 18 months ago, and the only advancements we see really are 10.1 changes to support mobile devices... things have slowed down considerably since Macromedia became Adobe.
Oddly enough though I was a big user of JRun (Allaire version) before it was brought out by Macromedia. Saw this product die a horrible death once Adobe brought out Macromedia as well.