Decide which settings they want to keep in house (most likely Realms, Eberron, and Ravnica), then allow original designers the option to update their settings for 5E either as 3PP or on DMs Guild. In the case of Greyhawk, I'd probably ask Rob Kurtz or one of Gygax's children to take up the project. Campaigns are an iffy proposition for WotC, as they seldom sell as well as primary products.
Wizards would continue to print Adventures in settings kept in house or given generic settings. APs seem to be winners for WotC, so no reason to topple the apple cart. One new mechanics/crunch book per year tops. Keeping the bloat down has been fantastic so far, and I'd like that to continue.
Wizards would continue to print Adventures in settings kept in house or given generic settings. APs seem to be winners for WotC, so no reason to topple the apple cart. One new mechanics/crunch book per year tops. Keeping the bloat down has been fantastic so far, and I'd like that to continue.