If China loses 200 million pigs, any tariff the Chinese gov’t puts on them may be inconsequential. At best it highly annoys their populace. Global markets will likely shift around quite a bit, providing many opportunities for US producers. Pigs are raised for slaughter in just 6 months from birth — how fast can the US farmers increase production significantly?
(Obviously we and other sources cannot begin to more than make a dent in filling the gap.)
Breeding and gestation take about four months, then about six months until meat is on the market.
There are huge stockpiles of frozen pork and other meat to avoid any real crisis in the year or so it takes to ramp up or restart production. But some price rise should be expected.