I am not sure Youth in Revolt understands economics, especially in a commodity like market like footwear (I paid for one on the best law schools in the country with futures trading, so while not an expert, I am familiar with scarcity).
So let's assume modestly (at best) educated Youth in Revolt is correct in that all of Nike's supply chain sources from Viet Nam. Even so, China's problems, which are significant and real, impact Viet Nam's own supply situation. Query how Viet Nam can scale and at what cost, and indeed, how fast.
And can they treat workers Foxconn style indefinitely amidst an increase in business. These are sound questions, not to be met by a poorly educated "Gawd".
There is no particular barrier to entry in shoe wear manufacturing.
So in one way or another the industry's sourcing patterns are indeed impacted by China. Large manufacturers you can bet they are very much looking at alternative sourcing plans, even if they don't source much from China. Scarcity impacts all .
And the same thing goes for doing business in China. It is folly not to have a non-reliance strategy or even an exit plan if things turn south. Indeed, major banks and finance institutions have been doing just that as Hong Kong is not longer a financial center grounded in the rule of law. Financial services are talent rather than hard asset based so the disruption in transition may be less.
Youth in Revolt - why the snarkiness? I gave no large opinions - are you not that educated and feel a need to remonstrate? I see this often. Be honest.