Re: Trump likes winners
Land is expensive in Vietnam, existing factories mostly aren't up to snuff, the power grid doesn't have the capacity in many areas, etc. To say nothing of the whole supply chain being in China. It isn't so easy as just putting out a "help wanted" sign in Vietnam.
There were companies already considering the move or in the process of making it because of rising wages in China, but it is a long process. Just like shifting production to China in the first place was a long process.