That is a possibility.No but if the stock price drops relatively fast to near or below the pre offer price it could definitely be a sign to other parties that the unit holders are interested in selling and you potentially could see another group make a bid for purchase.
But, keep in mind it is probably the "get rich quick" bunch that is dumping the units they snapped up at the announcement of the SEAS offer. Again units/stocks are LONG-TERM investments. But, there is a certain percentage of those short-term gain folks that buy low to hopefully sell high in a short period of time. They are like ants scampering away from the picnic that is no longer offering any scraps to devour.
So that leaves us with the serious long-term CF investors. I would not be surprised if Cedar Fair management put out some sort of electronic survey, with questions based on their financial advisors advice, to get the "pulse" of those investors opinion of the offer. If that were the case, it doesn't sound like the majoriy were in favor. That could, with other reviewed financial advisor infomation, swayed CF to nix the offer.
Heck, SEAS could go after the Six Flags chain. I always wanted to go to a Busch Flags park!