apaul is absolutely right, there is indeed room for development in Germany. In 2005 I flew to MUC, SXF and CGN and was impressed by the number of passengers flying. Admittedly it was the summer but they were midweek flights.
If HAJ-NCL had been a complete money loser for TUI wouldn't they have cut the route altogether? Let's face it Hannover is by no means one of Germany's big five cities. Additionally, didn't LH say earlier in the year that they were delighted with NCL and may eventually grow a bit more at the airport?
NCL does indeed rely a lot on the bucket and spade routes and there is nothing wrong with that. But NCL can also happily justify having scheduled routes to LHR, LGW, AMS, BRU, CDG, DXB and DUS and so it is much more than just a bucket and spade hub.
There is no doubt that daily flights would probably be unsustainable but I am sure 4 a week would be manageable. Let's hope that AB or LH realise that flights to NCL could be profitable or that EZ realise that fooling around with SXF was a big mistake.