I also think they will not give up that fast.
The longer they leave it until the next attempt the more puerile they'll appear than they do already.
BCH will always be out there, but I don't know how much lead they have left in their pencil for a proper hijacking.
With people like Billionaire Novogratz in the wings, they would be better off trying to build organically little by little. Problem is it's not going to be as fast as BTC, so the BCH:BTC price is going to continue falling.