I too remember several rounds of NMRA Standards being proposed (and ultimately adopted) with the LS forums quite united in a “we don’t need no stinkin’ standards” refrain. In fact, we did need standards. Unfortunately, with very low NMRA membership in the large scales, NMRA didn’t have the teeth to lean on the manufacturers to get their standards implemented.
Can this change in the future? I don’t think so. For no reason other then a widespread disdain for the Enema Ray as it was so fondly refereed to be the aforementioned TOC.
Personally, I don’t think there is really much else the NMRA can offer large scale until such time as they have recruited a significant number of LS members. I don’t see that ever happening. I’m not a member and have no reason to join.
As Fred mentioned, the standards are out there for anyone to use for free. I follow some of them, but since I use commercially made track, I’m only following wheel standards. Even then I can only come close since many of the wheels produced in LS are non-standard as well.
So does the NMRA have a role? Sure. They can continue to maintain, and update the standards documents and provide those standards to manufacturers. Whether or not they follow them will probably depend on cost and convenience.