Soundwave on 31 October 2009
UMD was only made by Sony, Blu-Ray is made by 40-50 different companies that Nintendo can use as a vendor, leverage against each other for cost. It's a technology that today is in laptops, computers, etc. and is a mass market product.
This would not be the case with a true propietary format. I'm not really seeing any kind of coherent arguement against this point.
