I actually do not want an everything game (stop putting words in my mouth), otherwise I would have bought Odyssey by now. I'd be totally happy with a game that takes Elite's Stellar Forge and aspects of its flight model and merged it with X4's persistent NPC-driven economy and aspects of its flight model, "space legs", and interiors. In fact, most of my dissatisfaction with EDH is not what it doesn't have, but rather the half-baked implementations of what it already has. If anything, I'm dismayed that Frontier is copying Star Citizen's feature bloat (Odyssey) rather than focusing on improving game mechanics already in Elite.
Or conversely, X4 could implement ED's dynamic solar systems (I don't need 400 billion solar systems, just a few accurate ones in motion) and better pilot AI and graphics, and that too would scratch my itch. Not that I'm expecting this, due to the processing requirements, but a man can dream.
If I wanted an "everything game", I would be talking about No Man's Sky, Space Engineers, Kerbal Space Program, etc.