Longform does not necessarily need to go away completely.
There is one thing worse than longform, and that is taped replay of weather coverage. This is exactly what the network used to do in the 'golden era' of 24/7 weather. From 2-5 AM, a taped loop of the prior hour would air. Later on in the 1990's, The Weather Classroom programs would air in the overnight hours, encouraging educators to tape the program for classroom use. This gave way to other programming including the shows we see today.
Programmers should determine what the most popular longform shows are now and air them in this time frame. Fans of these shows can capture them with their DVR (unless they are true night owls). Some of the shows are actually good. To the network's credit, some of the more outlandish shows have been removed. (Think "Fat Guys in the Woods", "Catching Hell", "Prospectors", etc.) At least the shows airing now have more direct relevance to weather although they are heavily repeated.
Of course anytime significant weather is occurring, LIVE weather would take precedence over any longform programming, even at 4AM.
The weather geeks and nostalgia freaks including myself would LOVE to see all-weather return. Time will tell whether weather 24/7 will carry the network or if longform really has been propping up the station, particularly with Weather Nation airing all-weather.
It will no doubt take some time for the new owners to dig in and make significant changes if they so choose. Current programs may be under contract to air until certain dates. One immediate change I have noticed though is in the commercials, particularly for movies released by Entertainment Studios. trailers for one such film, Chappaquiddick, have been airing.