Disruption is something that you can usually only establish after the fact. A decade later or so you can look back and say ‘x’ disrupted ‘y’. Microsoft did it to IBM. Disruption usually plays on a larger scale, for instance, the semi-conductor industry all but destroyed the vacuum tube industry (for certain purposes though vacuum tubes had hard-to-beat advantages potentially good enough for a niche revival). On the web disruption takes place at a smaller scale.
