Sadly, Norwegian represent the end-point of the airline industry in 2020. Low fares, tight margins, sub-standard employment T & C's, and now enormous over-capacity and debt.
I feel very sorry for their employees, but not for Norwegian's founders and top brass. The airline is destined to go under within weeks, although small bits may just be salvageable. (Unlikely)
The customers can't be blamed for greed, although their appetite for unfeasibly cheap fares has supported the idiocy and greed of the airline management.
The future airline world will be a reversion to low frequency, high fare flights, with many fewer and much better-paid pilots and engineers. The lesser-skilled pay grades such as cabin crew, cleaners, and the like, will all be paid as poorly as before. Perhaps worse. Sad.