Well, the last time Loganair gave BLK and BHD a try, it lasted for just 10 weeks,
FLYBE SERVICE TO ISLE OF MAN AND BLACKPOOL LASTS JUST TEN WEEKS
so I doubt they will be inclined to return unless economics have changed dramatically. With Vanair potentially gone, they might change indeed - however, I seem to remember constant bickering elsewhere about the high fares Loganair charges on non-PSO routes (and for that matter, even on PSO routes). And the same applies to Eastern. So big question - would folks be willing to fork out considerably more money than now to get to BLK, NCL, GLO, BHD or would they rather take the ferry or one of the lager carriers to BRS, LPL, DUB or MAN?
To me, the Citywing/Vanair concept always looked like one of the last survivors of regional air transport - but realistically on life-support as it only worked through this somewhat creative Czech/Manx setup.