Once again, every single issue listed in this article would disappear if Adobe freed Flash. I don't know how they can't see the necessity of this. They should do it soon, before serious HTML5 adoption gets underway, if they want Flash to last.
It won't fix the stagnant user interface issue, but it might fix problems with the slowness since new versions of CS use Flash even for UI widgets, so if can you can set it up such that CS uses a faster Flash Player, then you can get better performance.
http://en.wikipedia.org/wiki/Adobe_Flash#Open_standard_alter...
For Flash to really be open, Adobe has to open all of its associated technologies and they have to provide a decent reference implementation. The most obvious path to this is opening the Flash Player blob.
As such, it makes much more sense to open up Flash. Even if Apple opened iPhone OS, that would only solve the problem for Apple's devices (assuming Adobe acted upon the openness, though I don't see any reason why they would or why they don't have enough info to create it now), and everyone else's beefs with Flash would still exist.