I'm FIREd, but I'm not breaking a sweat.
Tariffs are a tax on consumption, so the way to beat them is to consume less. Defer big purchases, like cars and electronics, until you absolutely have to; cook at home instead of eating out; practice minimalism and don't blow money on crap you don't need. Those are all things I was already doing, and things that any frugal Mustachian should be doing.
Also, people who live off salaries are in danger of losing their job in a recession, but people who live off investments don't have to worry about being laid off. In the long run, corporations will raise their prices to compensate for tariffs, so their margins won't be affected that much and investors will continue to make a return on their investments.
I can live on 3% of my stash, which would comfortably survive the worst depressions history has seen so far, and I don't think this is going to be worse than that. The average American consumer is going to suffer badly, but we Mustachians are going to be just fine.