Thing is, as Laker, Branson, People Express et al found out, you fly long haul, your loco model does not adapt to medium term survival. Any carrier that has lasted has either been a historical flag carrier or a newbie with a low cost base and a premium offering down the front. That ends up not being too different from the legacy flag carriers.
Ryanair and easyJet don't fly long haul with good reason, however you really mean Norwegian. This is the reason they're involved in ball busting cost control and having staff based anywhere but the Nordics for the new pretend it's a standalone long haul operation. I am not sure what you mean by "start for real", the first year of B787 ops has been a challenge and the schedule is that of a charter outfit. Growth may well be in leisure but if they're going to go after price conscious and low yield, then you are going to need a MASSIVELY low cost base.