I suspect the late 1800s, another era when inheritance was a lesser source of extreme wealth, may also be unrepresentative of the "typical" state. Massive upheavals in technology (mass production, computerization/Internet) seem to me to be more likely to be exceptions, rather than the rule, over very long time horizons.
Regardless, we may be entering another era of consolidation since this article was written. It will be... interesting... to see how it shakes out.