Television does that. Radio changed because of television, but it didn't disappear. Nor will television with the arrival of PCs with tv programming. Whatever PCTV becomes, it must move into original content in order to succeed. Most certainly it will start out with a horseless carriage phase, mimicking the content of the old medium.
New media do that.
At some point though, the automobile phase must arise where original content unique to the new medium emerges. This tells us that Microsoft wouldn't beat the broadcasters at their own game. They must develop new games. Maybe they can. Then there's that complexity thing again.