The debt they've accumulated is their choice and their problem.
They aren't going to get $1.7 billion. It's worth $1.5 billion and it's not going to go up much, if at all as they train wreck attendance, TV viewership and stare down the barrel of a work stoppage in a year. They can either take $1.5 billion now or hope to get $1.5 billion in 2 years after they've accumulated another $100 million in debt.