That's a great point about Hurricane Harvey as a potential bellweather for an increased use of emergency plans in cultural institutions. I also wonder if the internet and social media also have led to an increase in best collections management practices. One of HHI's recommendations is to educate yourself and others about what various institutions are doing to protect their collections -- this is made a lot easier through the internet (e.g. news stories of how museums reacted to recent natural disasters) and especially social media (e.g. #AskAnArchivist and related hashtags). A more up-to-date post is definitely needed...
RE: Budgeting for Conservation of Collections : The Heritage Health Index (2005)