When I say Paris and NYC fashion week won't be kill I mean: the more artistic and high aspirational side of fashion will always be driven by humans (IMO) and humans will want to work with other humans. Not a fashion designer but I suspect it is hard for you to design clothes for a digital human to wear. I mean, if you're a game designer maybe you're moved by that. But not sure a fashion designer would.
I can definitely see how a major fast-fashion brand can adopt this practice.
Won't kill Paris and NYC fashion week, but certainly will decrease the number of models that are currently paid for more trivial modelling jobs.
[0] https://kotaku.com/most-pics-in-ikea-catalogues-arent-photos...