Adobe's core business is not developing platforms, but developing the editors and tools for designers. Graphic design, web design, vector, raster, doesn't matter.
They make money selling their software, not deploying flash all over the web.

Here you have a link to a comment I made a few months ago, about Adobe's shifting strategy regarding Flash:
http://news.ycombinator.com/item?id=3503774

I'll copy here some parts, so I can edit a little, mostly to adjust for current trends:

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Their business is to make and sell amazing Editors. CS is their main product. They bought Macromedia, just to own much of the market of Designer-oriented applications. And Macromedia filled a Gap.

But from now on, they are investing heavily in building tools for HTML5.
-You can see them building Flash-to-HTML5 conversion tools. [1] (this link is almost a year old, so I'd expect them to have something much more advanced by now).
- They are building HTML5 Editors [2]
- They stopped developing Flash Player mobile. [3] In the same post where they state that they will stop developing Flash Player for mobile browsers, they state: Adobe to More Aggressively Contribute to HTML5.
Ok, ok, they also state that they will keep working in Flash for desktop. But it's like when any software company says: "We'll drop X, Y, Z so we can focus on A". That's something said to please their shareholders, so it doesn't sounds like "As our products are no longer needed, we'll just kill them".

If you are a guest inside the browser, and the browser developer just throws you away (iOS, Windows 8 in Metro, only running in whitelist-pages), you have to move somewhere else.

Adobe just wants to keep selling their Creative Suite. So, the best thing for them to do, is to focus on HTML5, because they now know that Flash is doomed sooner or later. And they are doing it. I expect to see in the near future something like Adobe Flash Professional but designed for HTML5.

[1] http://labs.adobe.com/technologies/wallaby/ [2] http://labs.adobe.com/technologies/edge/ [3] http://blogs.adobe.com/conversations/2011/11/flash-focus.htm...

One more thing: Imagine for a moment that you are Adobe. You have an amazing suite of products, and a few of them are based on Flash. You realize that the browser developers have chosen to work and invest in something else. You go through all 5 stages of grief [4]. You deny it, you get angry, you bargain, you get depressed, but finally at least, you accept it. You HAVE to adapt and you have to work with them. But you won't have anything to sell for at least 1 or 2 years. And you still have this wonderful suite on the market.
What do you do? Do you go out and yell: DON'T BUY IT! WAIT UNTIL WE RELEASE OUR FUTURE-PROOF PRODUCT!!!
Of course not!!! You say We are already working on Flash Player 12 and a new round of exciting features which we expect to again advance what is possible for delivering high definition entertainment experiences
But at the same time, in the same paragraph you say: We will continue to leverage our experience with Flash to accelerate our work with the W3C and WebKit to bring similar capabilities to HTML5 as quickly as possible, just as we have done with CSS Shaders. And, we will design new features in Flash for a smooth transition to HTML5 as the standards evolve so developers can confidently invest knowing their skills will continue to be leveraged.

Read it again: a smooth transition to HTML5.

TRANSITION.

That's their way to say: "Keep buying and using our products, while we develop our HTML5 editors. Then, you can buy our new products and move to HTML5 too."

They have went through the last phase. They have accepted it. And they are adapting, good for them :)

[4] http://en.wikipedia.org/wiki/K%C3%BCbler-Ross_model