One hypothetical I wonder about is what the windows ecosystem would be like if third parties could make distributions of windows, if somehow that could be licensed and enough windows building/packaging was opened up. It'd be interesting to see whether collaborations of projects would form where they pull out MS parts and substitute their own, presumably with the constraint that they maintain compatibility. I imagine it'd take a while for any commercial products thinking of getting involved to figure out sharing, trust, and how to offer it in a way companies or individuals might want to donate/pay for.