To start very little, go slow get 1dnd the best you can while being compatible. Once that is ready for release have a starter set ready, build off of the original. A Return to Phandalin set 10ish years in the future (along with FR). Let the team show us what it looks like if the characters were successful. Sandbox style but would love to level 10.
Then release 4 books a year:
- New Adventure (like they are currently)
- A republish (fine tuning) of previous adventure; add in more options from AL Seasons (the work is already done, add maps and streamline). Build these anthology style.
- One cross-promotion ie. Magic (but get weird) make them less medievalish fantasy like steam-punk, wild west (call them World's of D&D or something to signify they are different). Expand what D&D can look like in other genres and settings.
- One semi-tightly themed book that explores and expands core 3. Part for players (new subclass, spells, feats), for DMs new hazards, exploration ideas, random tables, possible modular systems. Last part monsters go fewer but deeper, include ecologies, a few encounter ideas, lairs with rules. Start with Rural (countryside), Urban, Forest, Desert, Swamp... Wildspace, Feywild, Ethereal (Astral Sea), Shadowfell... Then someday Outer and Inner Planes. Each book helps build a sandbox that is not-setting specific but with sidebars for further setting ideas.
Don't think this will happen but it would offer a number of tools and ideas for DMs new and old alike. Supports both homebrew settings and published modules. It also might expand the D&D reach in new ways. Lastly montenize D&D by expanding horizontally... Focus on new player growth with tools for Encounters, box sets in various styles that can be sold at major retailers but given out to Local Gaming Stores or School Clubs to increase new players.