It has been quite a while since the Coast Guard tried using hovercraft. It may be time to have another look. Here is an interesting video (sales pitch) about how other services are using hovercraft. Many of the users in the video are in areas where ice and snow covered surfaces are common. With the Arctic opening up, there might be a place for these craft there.
The Indian Coast Guard has had some experience with these craft and have decided to triple their fleet to 18 craft.
Not that we would want them everywhere, but perhaps for some environments, they would be just what we need.