This move is far more interesting, surely, as confirmation that Flash has lost the browser wars and that web standards will determine the future of web applications.
If you make a living as a Flash developer, it's long past time to start learning about the web.
Then Microsoft joined the RIA fray with Silverlight, battling for control of the web. Flash was everywhere, SL up-and-coming. It was meant to be a spectacular battle, but both companies were blind-sided by this little web standard thing which was about to crash the party...
Except that it didn't. The war didn't end because someone won, but because Steve Jobs said so. It was only an illusion that HTML5 renders the RIA plugins irrelevant. In reality, it was the emergence of native apps. First iPhone, then Android, iPad, and now even Windows/Metro. Who cares about rich cross-browser apps?
So instead of developing a rich application that runs on all platforms, you either use HTML5/Javascript (if your application is not as hard), or implement the same thing on 3 platforms with 3 different languages on using 3 different toolsets. Wanna do something very rich/powerful cross-browser? Forget it! Everybody happy now?
What's held back web apps is not Steve Jobs, but the fact that creating them is incredibly painful and produces results that are barely acceptable except in a very small number of cases where the application is effectively a web page to begin with. The standards and libraries have evolved extremely slowly due to the difficulty of pushing out browser support across such a wide range of slowly-updating platforms. What counts as amazing in the average web app today wouldn't have been an impressive native client application in 1992.