I am from Norway, I read the newspapers over there and know pilots and instructors for the real Norwegian. (The original Norwegian Airlines, based in Norway have decent pay and work rules, the shell companies with other bases and pay-2-fly schemes not so much, but same owner and same paint job, AND no scope-clause )

I believe NAI's business model did not count on a real pilot shortage.
They have tons of airplanes on order and short of crews. The compensation package will have to go up, otherwise many pilots will quit and go to China or Japan once their contract is up and for 3 X the pay, or just go to the majors like KLM, SAS, BA, Iberia, etc.

As for the US bases: I doubt too many Americans wants to go through the hassle of getting EU tickets for mediocre compensation.
Been down that road before: I went to Japan and the Middle East to fly for the locals and had to sit for numerous exams and do several pain in the arse check rides, because the pay was a good it was worth the hassle.

Typically pay and benefits will go up to attract quality candidates, not too concerned that NAI will tear down the industry and make us all work for peanuts. Supply and demand..