I have no doubt Trump might think of doing that even though the effect it would have on U.S. economy and U.S. companies and consumers would be catastrophic.
If the US could get Europe and free Asia to go along, that would make it even better.
You're basically calling for a war with China and you expect the rest of the world to join in? Seriously?
A tad bit of an exaggeration there, FRiend. A refusal to trade does not imply a war. Heck, this sort of thing is done all the time, the latest being the trade embargo with Iran. Another one of note was the long trade embargo with Cuba.
To be sure, such moves are not always effective. And as you noted, there will be a blow-back effect on the US economy. But what's the alternative? Just allow China to claim that whole marine region?