Presumably to retain access to the US market, banking system, and preserve any assets they might have within reach of US law from seizure.

Maybe they'll decide not to pay and withdraw from the US completely, but that would seriously complicate any future re-entry once the current sourcing bans expire.

My guess is that they will switch to Chinese components and basically become a captive hardware manufacturer for the PRC government, which presumably won't let them fail completely even if their handsets are no longer market-competitive.