In the 90s, you would have said the exact same thing about linux on the PC.
Free software ultimately has time on its side. As long as a project has enough mindshare to keep its momentum, it really is unstoppable in the long run.
Where Linux shines is the absolute for-profit cloud/server world.
Open source has places where it works really nice, bazaar is better at "wider" stuff (having an active community, etc), while cathedral is more deeper/better at vertical integration, etc.
Free software ultimately has time on its side. As long as a project has enough mindshare to keep its momentum, it really is unstoppable in the long run.