This is a massive bummer - Teamsters helped protect and unionize a good number of ASD folks (my brother included) with Yellow/YRC and helped provide them with excellent jobs and benefits. My heart goes out to everyone affected by the shut down.
The Teamsters worked hard to keep everyone employed with good benefits - I had over a decade of relief knowing my brother had a job that gave him independence and a pension. The Teamsters saved Yellow around a decade ago by renegotiating salaries so no layoffs had to occur, which also saved my brother's job at the time.
Like the other comments mentioned I can vouch firsthand that it wasn't the Teamsters that botched the business, it was absolutely executive mismanagement. The union kept that place going for a long time.