Earlier quoted context omitted.
There’s no guarantee that lightning will strike twice in this case. When Firefox overtook IE6, Microsoft had been colossally mismanaging IE for years, which meant that IE had become a rusted husk of what it was in its glory days. This made for incredibly strong incentive for web developers to support an alternative, because having to develop for an utterly broken browser for an indefinite period of time was intensely…
This is an interesting argument. But this is effectively stating that Google has to be a good steward. If that is the case, then there really isn't much of a problem afaict (i.e. majority is happy). If Google is treating devs and users well, there is no reason to switch. It's when they falter on one, migrations can and will occur (given past history as experience).
Bootstrapping competitors is hard. Driving your competitors under and then cranking up the heat when the field is clear is a classic strategy.