I personally disagree with this.
First off, the park needs a bit of downtime to transition the park from Haunt to WinterFest. Yes, they do put up quite a bit of WinterFest stuff during Haunt (i.e. the candy canes in Tower Gardens, the tree out front, etc.), but remember the park also has to winterize the rides that won't be open during WinterFest AND they have to clean up all the Haunt stuff and put up the rest of the WinterFest stuff as well.
Secondly, you suggest the event would be in Soak City. The problem with this is there isn't much room in S.C. to really do anything really wor