Lets be honest here. WE DON'T KNOW Their intentions. When Cedar Fair purchased the park from the Knott's family, what was the first thing they did? They literally made a Cedar Point West, Xcelerator, Silver Bullet just to name two additions. What happened to Six Flags during this time in the region?
Bottomline, outside of Disneyland, the general area that Knott's caters to doesn't really have a family oriented theme park on the scale of KBF. Its a market that they can tap into and they have. Log Ride to give you an idea, is still very popular because its an attraction the family can enjoy together. Calico Mine Ride the same, and those two are currently the highest capacity attractions in the park, ~1300 Riders and ~1500+ respectively. Granted there is a obviously a nostalgic factor in both those attractions, too.
But back to my original point. 5 years of family additions doesn't mean that next year or the year after that something new and thrilling won't be announced. Will it be a Giga? Probably not... but something new, something fresh. Xcelerator = Prototype, Sierra Sidewinder = Something New. Let me ask you this. Would you rather have a Giga that most of us could probably travel to to ride. A mega which us locals can just drive to ride. Knott's is the perfect breeding ground for something new, compact and pretty incredible.
You have to think long term when running a business... sometimes. I am pretty sure that is what a conservative company like Cedar Fair is doing, at least on the West coast.