That is an astute observation. I do think the dialectic approached, rooted in open discourse will produce better results in the long term.
I think our commitment to Open Philanthropy will provide sufficient flexibility and freedom for different paradigmitic points of departure to contribute what they can to how the OER university concept unfolds. We should also recognise that different institutions are at different points on their open education journey -- however, they will still be able to contribute within the parameters of their own autonomy and restrictions. In the end, all contributions will add up to "more than the sum of the parts".
You sum up the opportunities rather well -- we are all human. The notion that the the worlds knowledge as a public good is fundamentally human and this must be good for society. This is why we will achieve success!