I did not consider this! you have a really good point, a non-decision is in fact a ticking time bomb.quietly forgetting about it is a constitutional crisis though, since TikTok ban is a federal law passed by US Congress. It would mean that the president can ignore any law that is inconvenient to enforce.
There's no win here other than scaring Bytedance into an unfair sale. Ban, fair sale or forgetting are all losses.
But optimistically, the idea is that the next administration is less crazy than Trump, and they would see how banning tiktok is a blatant violation of their own country's constitution. Not to mention even if they are dead set on being anti-china, they will still need to listen to public sentiment. And after the Trump administration, I believe that there will be a HUGE public scrutiny about governmental overreach, which would be in benefit of Tiktok.
We will see how it goes, these are just educated guesses.