Plaese note that the expansion of the Linux System Definition was announced/implemented (March 2012) at the same time that Sony and Phillips decided to carve out a lot of their patented technologies from the OIN License grant.
For example, any patents related to any mobile devices (undoubtedly a major industry with a lot of Linux use) are no longer part of their grant.
I think it pretty clearly states that there are two kinds of members of OIN: Those who actually believe in the general virtue of an open patent pool, and those who still benefit from traditional patent licensing (Sony, Philips) and thus have quite different priorities than the other members.