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