I have used various forms of linux for over 10 years and actually created a UNIX command line compiler during my applied computing degree so I have a pretty good understanding of what's involved with the OS variants. I currently use Fedora as it is a balance between enterprise grade software and user grade.

it would not take a huge amount to boost linux enough to overtake windows, but currently it involves a degree of organisation and maybe unification that hasn't been present yet. there are also issues with larger companies doing licensing deals with microsoft etc. - but this may become less relevant the more advanced linux becomes.

what will help the most is open source hardware schematics that can be replicated with 3d printers etc.