They only profit from the sale of the authoring tools; the runtime is free. (In fact they're probably paying everyone to preload Flash.) Their content authoring suite has no real competitor. I can see culturally why they are so wedded to Flash (they spent $3.4 billion on it four years ago) but it's not like CS* sales would crater if everyone switched to HTML5 (assuming Adobe tools started writing HTML5). If anything the market would grow. I think Adobe knows this. The writing is on the wall so far as Flash is concerned.