The fans who aren't happy are the ones who have already forked out a big wodge of cash for their season tickets. Now they're being asked to pay again, and that's what they're unhappy about. And to be honest, I would be too, if it was me.
It'll be sorted out. My guess is that they'll end up getting some sort of refund, or like Cardiff season ticket holders, they will get some sort of free pass. I don't think this story has finished yet.