Well not that I care, since I don't buy DnD products...
IF there was going to be a "DnD Killer" (which I don't think DnD will ever die as a brand or game) - but when 6e drops and they go more Woke(tm), it might create another 4e event where another system overtakes them.
Unlikely but you never know.
But again, this is a case of WotC being the DnD-Killer. The brand is the sky under which all RPG's are played. Just like if for some reason WotC folded, and Hasbro sold the IP off to Free League, and they slapped the DnD banner on their house system and ditched d20... the sheer brand-momentum would pull a massive portion of the gaming populace with it. I actually think that would be good for the hobby - but that's all fantasy talk.
I say this as I watch the American Comics industry implode... one can only hope.