Kings Island and Knotts definitely are going to be the next in line for a giga coaster, after that I really don't see them going into any other park since they are just to big and much too expensive for those other parks you mentioned. If Dorney didn't have any height restrictions then maybe I could see one there, but that park needs to focus on getting a GCI woodie. Worlds of fun is a nice sized park and has great potential, but again Giga's are just to expensive to go to these parks. Cedar Fair is just being reasonable and spending a lot of money on there big parks with coasters that are very expensive like banshee, Fury325, leviathan, and gatekeeper and spending a little money on there smaller park with cheaper coaster ( GCI woodies) like Renegade, Prowler, Goldstriker, and a future woodie to Dorney.