In the long term, what's at stake isn't so much Huawei's business (since that will dry up very soon, as China transitions to sourcing all of its technology internally), but whether any other foreign firms will run the risk of sourcing from US suppliers.
Trump's tech export bans could seriously damage the long term health of the US tech sector. For that reason, I'm hoping the administration doesn't just reverse course, but actually loses a court case on its legality. Otherwise, foreign firms (even in friendly countries) will always worry that their supply & support from US firms could suddenly get shut off.