HTML 5 is part of the death-recipe for these native RIA technologies, but there is one other major missing piece at the moment - a fast and dependable javascript engine that can be assumed to exist on client machines.
HTML 5 just provides the UI / Drawing capabilities, but it will have to rely on Javascript perform the processing logic that is necessary in most Rich Internet Applications.
So, when it can be assumed that HTML 5 is fully implemented AND there is a fast enough Javascript engine to rival native code (similar to .NET in silverlight, actionscript in Flash, and Java in JavaFX) - then then open web will truely take over.
HTML 5 just provides the UI / Drawing capabilities, but it will have to rely on Javascript perform the processing logic that is necessary in most Rich Internet Applications.
So, when it can be assumed that HTML 5 is fully implemented AND there is a fast enough Javascript engine to rival native code (similar to .NET in silverlight, actionscript in Flash, and Java in JavaFX) - then then open web will truely take over.
And personally, I cannot wait for that day.