They never invented one successfull webdeveloper product, and those they bought from Macromedia ( Dreamweaver , Fireworks , ColdFusion , Flash)...havent evolved a bit or are dead.
They fired most of the legacy Macromedia work force anyway. They should sell all these tools or open-source them.
So what happened is that, to reach this new segment of the market, web developers needed to develop two versions of their applications -- one for iOS and one for everybody else. This in turn spurred development of non-native web technologies, for those applications where a fully native version wasn't feasible, which further reduced the demand for Flash. Adobe was forced to try and play catch up, and that's a really tough position to be in.
Good riddance, but I'm fully expecting Flash's niche as a provider of abusive advertisement and wretched restaurant menus to be filled soon enough. To paraphrase Jurassic Park, "shitty software will find a way."
That said, I personally would still avoid Edge just because of Adobe's past record. It might seem petty, but I've lost faith in the company so there's little incentive to pay to join their HTML5 services.
Heck, if someone made an OSS clone of Fireworks I'd be happy. Why is everyone in the open-source community with graphics knowledge trying to clone either Photoshop or Illustrator? (And no, I don't mean "a pixel-art editor" in the style of Pixen; Fireworks indeed does that, but also contains the live vector texturing and manipulation logic from Flash.)