You know the drill - If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should start on Monday, and end on Sunday.
4. Open Threads should be posted in Discussion, and not Main.
A good decision theory performs well in many problems and not only in one problem. Having a decision theory that solves Newcomb's Problem but that doesn't perform well for other problems isn't helpful.
There isn't yet the ultimate decision theory that solves everything so I don't see how individual problems can be declared solved.