The USA have been isolating themselves from the rest of the world, by imposing trade restrictions on some imports. The majority of the ASIC miners are being manufactured in China and imported from the USA and other countries. This raise some important questions :
~ Will this influence imports of ASIC miners?
Probably not, unless it's some form of goods/items that can abundantly be found in the USA? I doubt they'll impose some restrictions on machinery such as ASICs and the likes.
~ Will US companies step up to manufacture their own ASIC technologies?
AFAIK, there had been some companies which attempted to create their own ASICs in the past but failed. BitFury is there but the sales is just meh compared to the Chinese giants. If the price of bitcoin overshadows the price of creating ASICs tenfold, I think the Western lads would probably try and enter the ASIC manufacturing business with a bang.
~ Will GPU sales increase, if ASIC miner shortages increase?
GPU sales actually increased even without ASIC production shortages, so this analogy is somehow skewed and wrong.
~ Will companies import these ASIC miners from other countries? <China -> Italy -> USA>
It highly depends. These companies would find a way to avoid the trade restriction so there's that.
~ Will Mining farms in the USA relocate to other countries where there are no trade restrictions?
Refer to the point above. If they can circumvent the goods, why would they need to relocate their whole operation?
~ Will a decrease in sales/demand from the USA, drive down ASIC prices?
Given the statistics that a huge percentage of miners hail from the East, I doubt this will cause a large impact on the manufacturers' side.
~ Is this a storm in a Tea cup?
No. Just a man-baby with tantrums going rogue.