Right now? Dump Next, it's got no buzz. Sack everyone, let 'em all reapply.
Turn the website into a giant forum for all of D&D ever, fan moderators regularly turned over and fan-rated. 2.0 all up in there.
2012 put out the "end of edition" books for 4e, the usual big compendiums, only without all the fucking whitespace and brown artwork, crunch heavy, small text, final errata never to be touched again.
2012 publish something for Pathfinder, convert and expand a GDQ mega-module campaign or something. Have the D&D logo,
and the Pathfinder logo on it. Make the connection. Make a buzz with the few remaining fans. Then go quiet.
2012 Get a digital crew to seriously tidy up the back catalogue and get it all online, use every reseller who wants in. There's thousands of those fucking things and people will pay a few bucks each for them, money for nothing.
Watch what moves. All the time. Talk about what's moving. What's wrong with it, what's right with it.
Add everything to this as time goes on, delayed by no more than the big retailers absolutely demand. Hope like fuck anything new outsells the old stuff.
2013 Let anyone who wants to write whatever peer-to-peer D&D software they want, using the SRD or OSRIC, as long as it's entirely open source. Ignore 4e. Play some D&D. Run some big playtests on our nice 2.0 forum. Run games on G+ and whatever else works. License non-open content from all editions to all stable platforms (according to fan voting, all 2.0 like).
2014 Publish a Basic-like game. Black & White internal, box with dice and shit in it for the mainstreet shops, two small 64-page softcovers, as many levels as can be squeezed in. Call it "Dungeons & Dragons". Keep the numbers small and the math to a minimum. Pack the words in like there's only young eyes reading it.
Get someone without Aspergers to write the fucking thing, pay editors from well outside the hobby to tell us if it's legible. Peer review the fuck out of it. Roll-under, bitches.
Plus an open-ended adventure-campaign reminiscent of the Isle of Dread, included. Try not to go bankrupt.
No playtests, just teaser-leak everything via the fan sites and a mag. Monthly drip-feeding of full content for nothing and
listen to the feedback.
2015 Publish a hardcover, greyscale, Advanced Monster Manual for Dungeons & Dragons. Hit a price point. Stick monsters on a super-simple power use structure.
2016 Publish a hardcover, greyscale, Advanced Player's Handbook for Dungeons & Dragons. Like, 15 classes, 50 useless "downtime" skills, combat options other than "I attack", way more than 8 spells per level, only up to ~15th level and 7th level spells. Multiclassing via gestalt.
Reprints include errata, 2e style, errata in a pdf too, 3e style. Just fix any crazy-broken stuff slipped in, and spellos. Leave the game alone for a decade.
2017 Publish a hardcover, greyscale, Advanced Dungeon Master's Guide for Dungeons & Dragons. Full of tables and telling people to be neither a dick nor a pussy. Include world-building shit for all the monsters and possible NPCs. Tell everyone not to use the advanced book for NPCs, reprint the simple classes.
None of this is open content. It's licensed to people who handled the old 3e/AD&D open content well (or anyone who has the money, really). Open source programs, licensed product data, so they and we can make money off it. Let them find their own funding. It becomes open content when we dump it for a new edition in ~2025.
2018 Open source the Forgotten Realms, SRD style. Gods, nations, cities, rulers, characters, eras: go nuts. Retain novel publishing rights and publish them. Publish a tiny FR worldbook all prosaic about the Dales and 'minster. Drizzt dies.
2019+ Start cranking out the classics, no splatbooks, just leak-tested hardcover expansions for Dungeons & Dragons. Worldbooks for any busy downloaded world and adventure material from earlier editions.
Not that seven year plans can possibly last.

PC, SJW, anti-fascist, not being a dick, or working on it, he/him.