That may very well be true if you are relying on passenger traffic to support the operation. For Norwegian, the route was more dependent upon the cargo, which would have made the route successful, but failed to communicate that fact to the front line employees who operated under the impression that passengers should have come first on that route. It was only after the route was cancelled that management decided to communicate to the employees that cargo should have been prioritized. Also they failed to invest in a decent load planning operation, instead outsourcing to the lowest bidder, with the unsurprising results. Just one of the many things Norwegian management screwed up.