Huh. A few things, come to think of it…
Fire everyone responsible for the "de-authorization" attempt.
Make OGL 1.0b, a copy of 1.0a with whatever language updates are necessary to make it clearly an irrevocable license. Give ownership of that license to the law firm working on the ORC or the Creative Commons organization.
Release SRDs for every edition under OGL 1.0b, ORC, and Creative Commons.
Keep 5E core in print but let the community of 3PP take care of the rest. Slight rules revisions over time to fix broken things more than new editions.
Approach various creators and 3PP who are interested in more, less, heavier, lighter version of the game and work with them to create the modularity promised during the D&D Next playtest. This might be completely moot now that the 5.1 SRD is in Creative Commons. But still worth a try. More tactical stuff...Matt Colville if he or his team are in any way interested. Hire them to work on it. Lighter, more story-focused and character-driven stuff...Matt Mercer and Critical Role. Hire them to work on it.
Bring everything ever officially printed for D&D up to snuff re: text, layout, etc, i.e. no more bad scans, aka go back and re-typeset the lot. Sell the PDFs of everything and offer them all up as high quality POD. Yes, many are there already but most are bad scans.
Do Kickstarters every year to do print runs of older core books. One Kickstarter a year but cycle through the editions. Don’t leave any behind. OD&D, AD&D, 2E, 3E, 3.5, and 4E. Basic, B/X, BECMI, and RC. If not enough people are interested, it won’t fund, so no problem.
Open all the settings on DMsGuild. Take less of a cut.
Make “ultimate editions” of all of the settings. Gather up all the lore, all the monsters, all the NPCs, all the locations, all the maps, etc from all the editions. Square any contradictions and publish those. That will be easier for some than others. After the initial release, do Kickstarters every few years to keep them in print. Start with Mystara and Hollow World. Next up Dark Sun. Next is Nentir Vale. Go from there. Publish free PDF rules updates for those settings, if necessary.
Hire whatever original creators of the settings are still around and interested. Let them have creative freedom to do as they please with their creations. Legal ownership would be retained, creative control would be handed over. Like Keith Baker. If he's still interested, give him creative control and freedom over Eberron. It's his. If he wants to make an Eberron for Savage Worlds game, go for it. Weiss and Hickman want control over Dragonlance, it's theirs. Do that with anyone and everyone still around. If WotC owns the IP, give creative control over that setting to the original creator(s).
Reach out to and make deals with various 3PP creators similar to the deal with Critical Role and their two books. The 3PP retains ownership of their IP, they create the content, but WotC funds the project and prints it as official D&D products. Set terms to drastically benefit the 3PP.
Give Goodman Games free pick of any old modules to update and make conversions for Dungeon Crawl Classics. Secretly pay the cast of Critical Role to run a short campaign of DCC. Say a five- or six-shot. Start with 0-level, of course. Then one night at each subsequent level, ending at 4th or 5th.
If it becomes obvious this is not profitable and it's going to sink as a company, gift the settings back to their original creators. It's their stuff. Their dreams and ideas. They should own them.