Every server owner asks the same question the moment a new title is on the horizon: how much of this survives? The honest answer is that your assets almost certainly do not, and your systems design almost certainly does.
Streamed models, handling files and timecycle edits are bound to the engine that consumes them. Treat them as depreciating stock. The economy you balanced over three years, the job progression your community actually enjoys, the dispatch rules your police department settled on after nine arguments — that is the part worth carrying forward, and it lives in documents and database schemas, not in .ytd files.
The practical move right now is separation. Pull your business logic away from framework-specific calls behind a thin adapter layer. If your bank module talks to `Framework.AddMoney` in forty places, you have forty rewrites waiting. If it talks to your own `economy.credit()`, you have one.
Second: write your content down. Character backstories, faction histories, whitelist criteria, and the unwritten rules your staff enforce by instinct. Communities do not migrate because of code; they migrate because the world still feels like theirs.
Third: keep your database portable. Avoid engine-specific blobs in player tables. Store identity, progression and ownership as plain relational data you can export tomorrow.
None of this requires knowing a release date. It is just good architecture that happens to double as insurance.