If Linux was dominant it wouldn’t be Linux. There would be more pressure to monetize and there would always be someone willing to sell out for that money. You can see this even in the Linux community today. I’m sorry I had to be so negative about it though, it sounds nice.
Not really. Having heterogeneity among operating systems is better than pure homogeneity. Say, if everyone ran Linux, and some massive security flaw was discovered, we would all be screwed at the same time. However, if we ran different stuff, and some massive security hole was found for just one operating system, then only a small portion of the world is vulnerable at once. Besides, more operating systems can lead to more innovation, as long as there is good competition between them.
Nah, industrial and infrastructure should mostly use BSD. And "Never see a command line" consumer OS's should generally be forks from Linux or other FOSS. Most Linux distros have come a long way and are ready for gaming prime time, but fail the "80 year old grandma who wants to digitise her record collection but is a bit unclear on double-clicking" test.
I mean.... More computers run Linux or gun hurd than virtually any other OS at this point... Virtually every phone, virtually every smart device -- my smart light bulbs run Linux! My ptz camera ran Linux! A lot of smart televisions run Linux!