Honestly I don't think there will be a penny drop moment.
There hasn't been for Brexit backers.
I'll post this text here, from an investment company's email to it's clients, about the broader economic outlook for the US:
"The reason the U.S. runs a trade deficit is because American consumers spend more than they save, a situation made possible by the Federal government spending more than it collects in tax revenue. Interestingly, while the tariffs are substantial, they probably aren’t enough for exports from most emerging economies to become uncompetitive relative to U.S. manufacturing.
U.S. productive capacity is insufficient to meet its domestic demand, and that situation will only worsen due to immigration curbs. Without immigration, America’s working age population is projected to start declining. Therefore, it seems unlikely that these policies will spark the manufacturing revolution President Trump is trying to achieve."
The ageing population without the migration also helps explain the fretting of Vance and the right about birth rates