Unless I'm misunderstanding again, Joshua hasn't said that LDraw.org cannot add to this texture mapping standard in the future. He's saying that he does not want any sub-set of the standard he documented to be approved, and he doesn't want any changes to be made in the portion already documented. Furthermore, he expects to add new features in the future (that may be approved or not by the LSC).
I'm not saying that even these restrictions are necessarily acceptable to the LSC, just that things aren't quite as bad as it seems to be portrayed.
I'm not saying that even these restrictions are necessarily acceptable to the LSC, just that things aren't quite as bad as it seems to be portrayed.