The problem is that proprietary drivers do cause major headaches when it comes to adapting and upgrading your infrastructure. If some major hardware vendor is dragging its feet or doesn't want to commit resources to make sure its drivers work in your new sandbox, it puts a brick wall in your path.
I think it is entirely appropriate that the FOSS community should apply any and all forms of leverage available to alter the driver landscape in a way that favors our open development practices. It's great to do that in collaboration with the manufacturers, but for those that stand in the way of progress, all options should be on the table.
I'm a strong capitalist, which means that I recognize the real end of capitalism isn't so much about turning a monetary profit but is more about driving the marginal cost of everything towards zero... to not have to work for the things we want. We should want to commoditize the driver market, the same way we've done for other markets.