For starters, he could do what he did with CBS: threaten a potential merger. Or he could do what he did with Musk: threaten to revoke citizenship of the CEO or anyone on the board if they're foreign. Or do what he did with Harvard and Columbia: threaten to pull grants and revoke foreign visas of workers. Or do what he did with big law firms: threaten to pull security clearances.

Lots of options.

He's already weaponized the IRS, DOJ, and FTC, so there are a lot of ways he can fuck you for not bending the knee.

Realistically, many companies are going to shut themselves down because their margins will be gone.