Water coasters, enclosed park for weather reasons, etc.
Also to add some fuel here, VB has been attracting significantly more guests than the WDW water parks per day. "We did every water slide in 3 hours!" well yes because 5,000 unique guests entered that park that day.
I can see Disney having to do a massive rebuild and possible re theme of Blizzard Beach. There are some significant issues with infrastructure in both parks and BB seems to have it the worst.