I agree on both counts. But to expect airlines to sponsor divers on unprofitable routes is not reasonable.
Basically the premise is that if dive operators/shops think that flights are profitable for an airline to run on a daily basis and airlines don't run it they are free to charter flights. If they are correct they will make money, if they are wrong they will lose money. But for dive operator/shop to expect others to run that risk is not fair.
Well, I don't have any expectations one way or the other, but airlines are much more accustomed to assessing and dealing with the risk, and they also can spread the risk around over lots of routes. Also, a one-time charter of a plane is a very expensive proposition.
But as I said earlier, if the move on Continental's part is just to pull back during a slow period, then it's no big deal.