No need to worry about smartphones, as Apple would simply ramp-up production in China. We might have to produce commercials similar to the ones we see for poor children around the world: "Johnny doesn't have a current-model smartphone because of the second Korean War. Please give generously so he won't suffer."
It's understandable that the network of Rick Santelli would decry any reduction in free trade, given that, for libertarians, "free trade is not a policy option to be debated, but a dogma to be defended."
As for the national debt, Trump has that all figured out, as the debt caused by any pesky war would pale in comparison to that caused by his proposed tax cuts.
One thing that CNBC could have mentioned is that 73.5% of DRAM originates in South Korea, specifically from Samsung and SK Hynix, so Korean War 2.0 would cause prices for RAM and associated components to skyrocket. Samsung and LG combine for around 34% of televisions, so that might be a problem too.