Been working in flash since version 2 and years ago I wrote a 3d engine in flash mx by duplicating and scaling right angled triangles to draw all the polygons. Professionally, I am often the person who recommends what technologies get used when a site gets made. And I very much doubt with this recent news from adobe that I will bother to use flash for a commercial project ever again. Especially given what you can get…
Flash support has been poor on Linux for a very long time. For example, 64-bit Linux desktops have been popular for most of the last decade, and I'm not sure there's ever been an official 64-bit release. Sure, it's been possible to get it working, but it's a hassle. The poor Linux support is one of the main reasons so many Linux users dislike Flash and are always saying how it needs an open source alternative version.
Since Linux support has never been a big deal for people choosing Flash in the past, I can't see this having a big impact on their decisions now.