The websites that are platform depended are so few that we know the names of them, and it is currently very expensive to make platform exclusive sites. Is the case of Netflix the reason why we want more of them?

Linux has flash, it has silverlight, it has java. In the beginning they worked terrible, but thanks to the effort of open source developers, sooner or later it they got ported. When each publisher has their own DRM platform, copying the business model of the console market and earning money on the concept of exclusivity, how many open source ports do you expect to see?