Because MFF has "Furfest" trademarked, they had to defend their trademark. If they didn't, they lose it. Furries are gonna take that how they will, but that's legally defensible. Any company with sense would do the same.
More related to the event, their overzealous sale of merchandise for this event that doesn't exist has already bitten them with the name change. It's going to bite them again if they have to change it again.
And while a camping con is an admirable goal, October is a rough time for camping. The weather is unpredictable, the wasps are hungry. If you're going to add in dealers on this, to try and make it a full on furry con, it screams disaster waiting to happen.