For the most part, they can't, because a new standards body will spin up. The history of WHATWG [1] is illuminating; WHATWG being the community -- of largely browser-makers -- behind HTML5 and other specs that moved the web forward from 2004 to now; notwithstanding how you feel about W3C or WHATWG, it's impossible to deny that once a standards-setting group no longer meets the goals of its members, those same members are likely to go start something else.

[1] https://en.wikipedia.org/wiki/WHATWG#History

One problem with standards organizations is that they have a bunch of people whose job is to make new versions of the standard. Look at the evolution of openGL, the web, C++, Unicode (love hotel? Poop emoji?) and so on. Even ASCII evolved to 8bit and the got ansi escape codes, but it's stable now. C is fairly stable now but that's because all the new stuff is in C++ (much like HTML replaced ASCII).

Initially I was going to let the other responses stand on their own but I had a new thought.

Unfortunately it seems the spec by fiat process is the least problematic this way.

Someone standardizes a thing that has been working for them for a while and they want their partners and maybe competitors to work with it.

It has to be a fairly conservative spec as well, something that can be defined concisely.

And let me be clear: this is a necessary but insufficient quality of a good specification. Ramming an opinionated spec down everyone's throat that is clearly tilted to only be achievable with your company's patent portfolio is not playing nice, and people tend to sense the insincerity.