I don't think that a single variant rule will destroy D&D, I think contributes to it, and if they continue down that same slippery slope of listening to and then hiring out of touch political activists that try to turn it PC then it will. By the time Marvel destroyed itself the comics were hamfisted, bad quality attempts at weird ideological propaganda written by crazies who spend all day making paranoid delusional attacks on the established fanbase.
It's like a cancer, if caught early then the prognosis is good but it can spread and become terminal if left alone.
