I'm not entirely sure that is a fair comment, given his many FOSS contributions. I think Linux is a meeting point of many ideas, and Miguel (and Nat and many others) had their vision. Maybe they saw something like OSX. Others saw (and are seeing) something else. RMS had/has his vision. I think its perfectly fine to do your best to make your vision come to life and when that does not quite workout, do something else. Your contributions will remain, and can be used by others to build on. This is the true power of the FOSS philosophy, that it is the sum of disparate agendas, IMHO.