As usual, Seth makes a great point. The convergence happens naturally, and often there is a evolutionary aspect to the curve of adoption. Sometimes, though, there’s just no comparison. In a way, it’s surprising that we who have internet access at high speeds still have televisions and cables around today. I ask again, when will NBC take down their transmitter, and just use their routers?
If the telephone guys had set out to make something that did what the telegraph does, but better, they probably would have failed. Instead, they solved a different problem, in such an overwhelmingly useful way that they eliminated the feature set of the competition.
The list of examples is long (YouTube vs. television, web vs. newspapers, Nike vs. sneakers). Your turn.