You can push HTML 5 and canvas all you'd like - but from a pure business standpoint if I can reach 98% of my audience with Flash, but only 40% with HTML5/Canvas I'd be an idiot to not choose Flash.
It will be WONDERFUL when I can use canvas to draw realtime graphs and know it will reach 98% of my users. That day is not today and it won't be for some time to come. Now, that being said I and doing exactly that task with canvas for a project - but it's as a backup of the Flash version since the client expects a sizable iPad/iPhone audience.