A major benefit of drop shipping from China was the pretty much $1 shipping for almost any item via ePacket.
Obviously the products are still cheaper, but with a 25% tariff on most goods, and what I can only assume will be a close to DHL price for shipping, a t-shirt drop shipped from China will probably cost more than one made and shipped domestically.
To continue to be competitive, drop shippers are going to have to think about bulk imports and warehousing, thus no longer being drop shippers.