I've now heard several emergency management programs looking to switch their EOC information management systems from a provider like WebEOC to a self-developed SharePoint solution tailored to their needs. The tools are similar and a talented SharePoint user can set up a solution that works. It also is the collaboration tool aspect of SharePoint that can be leveraged everyday in a regional setting that is very powerful. My previous organization, King County OEM is developing a regional SharePoint site that will share the collective plans of the region plus other valuable information.
If I was WebEOC I'd be looking for ways to differentiate myself from SharePoint. Otherwise their market share is going to be going down.