Could be done, although I understand that the SVG & BGO would operate as a 'triangle' NCL-SVG-BGO-NCL (or BGO first, not sure) Of course the downside here is pax coming to NCL from SVG will have to stop off in BGO first. Still quicker than flying into MAN and coming up by road/train.
Re EZY, haven't heard anything about losing SPU but it did have lower loads this season. I think Croatia/Slovenia etc may still be a bit niche, and once people have been once that's it. Same story with Bulgaria, rapid expansion a few years ago but found the happy medium. That said all the Sharm and Turkey pax have to holiday somewhere, although they'll probably just flock to Benidorm.
Also, nice to see an EWR flight without a 2+ hour delay today.