Arrow has been out of business for close to 20 years. That makes this hard to find parts for. Cedar Fair is taking out their Arrow suspended coasters as well, so this is not too much of a stretch or a shock. Firehawk was not only a nightmare with capacity and plagued by issues, but Vekoma upgraded the model and probably made it harder to find parts for this model of Flying Dutchman. Arrow being completely out of business means that aftermarket parts can be found, but that it not always the best idea. I honestly think that if Arrow was still around, Vortex would have many years left. It is also probably not an easy decision. I do not think that this was out of the blue, and I am almost certain that they will be removing Top Gun/Bat/Flight Deck within the next 5 years due to it being an Arrow coaster. I am said and upset to see Vortex go, as it is in my top 10 favorite coasters, and will always be grateful for the credit.
However, I think that the positive might be that this could be the site for an ground up RMC (timeline of an RMC build works out of about 1.5-2 years minimum). Kings Island has the next coaster at least in development after Orion, as it takes about 4-5 years from conception to completeion for a coaster, at least according to the research I have done.