"You can see from the above anything under 4 ounces is actually cheaper to ship from China. From 4 ounces to 8 ounces the rates are pretty comparable. Once you start hitting about 2 lbs, the prices from shipping within the U.S. start to get comparatively cheaper and cheaper than shipping from within China."
I seriously doubt this was ever an existential in the sense of the shipping cost itself destroying a business. China is simply able to produce cheaper things because they have lower labour cost and so on, and that is actually good for American consumers. It's simply free trade.
If anything I see a much bigger threat in the ability of the US to raise the prices, because given the current administration it may be used as a protectionist tool.
[1]https://www.statista.com/statistics/974065/cross-border-deli...