I would pay a fairly significant amount to have access to working final server/client files and tools to host/run the game after final shutdown. I believe games like this should have an end of life plan. All games that rely on publishers/hosting services continuing to do so, should have an end of life plan for when their game goes offline. As well as a permissive but restricted License that handles the nitty gritty details that companies can get hung up on. It's fairly simple in terms of releasing such a thing. They don't need to release source code. Just the server software, and basic instructions on the environment and supporting software needed. ie sql database etc. Any supporting tools specifically for the server, such as tools for implementing new quests, npcs, items. And client Software that has a launcher that can be aimed at whatever IP

ort combination needed to connect to someone's personal server.
In the case of DDO specifically, I wouldn't even be Mad if part of this whole deal was a sale. You pay for the software, this payment grants you a license to run a not for profit server, and be allowed to distribute a client for that server. You are not licensed to distribute the server, just the client. So only one person needs to pay for it, but their whole gaming group can play.
I do not see them doing that, I dont see any of these companies running live service or free to play MMOs doing anything like this. The few examples of it we have are great, As someone Mentioned Megaman Dive Offline, thats a great example, I think they missed the mark not adding peer to peer to keep someone of the actual multilayer componants in. But they did at least keep the game availible by doing this and thats a lot more than mnay other games have done.
I'n my opinion, this is probably the best way to hande end of life. Just monetize it. Pick a fair price that people are likely to be willing to play, and just charge them for it. This way you make that one last burst of money from the thing your shutting down, and can take that forward towards new projects.
But, let's hope for the best, and that DDO gets to keep on running, and the devs can smooth out the wrinkles... (like seriously, can we fix Vial Smash spells so they actually damage things? How is my Alchemist supposed to handle groups.)