At some point after the 1950s, en-gb speakers had to resign themselves to the dominance (if not prestige) of en-us; might the same process happen with en-us and

At some point after the 1950s, en-gb speakers had to resign themselves to the dominance (if not prestige) of en-us; might the same process happen with en-us and en-in? (and then there's en-gb vs en-eu...)