As much as I hate to say it, Flash is perhaps becoming obslete. I still do know a number of programmers who create games in flash, but they're using ActionScript2 (AS2) rather than ActionScript3 (AS3).
It might be true tha Flash itself is going away, but there are many languages whose syntax are derivatives of ActionScript, such as HaXe, which is used in engines like Stencyl, which itself creatives native flash applications.
For developing flash games OpenFL with haxe is very nice.
As for the flash is dying post:
I have been a flash game developer for 4 years and for 1 and a half years i switched to unity once it got the 2d update.
I strongly suggest you give it a try, it's worth it :)