rfc, future-work: implement in the template.

Author: Centril

0000-template.md

@@ -72,3 +72,24 @@ Please also take into consideration that rust sometimes intentionally diverges f
 - What parts of the design do you expect to resolve through the RFC process before this gets merged?
 - What parts of the design do you expect to resolve through the implementation of this feature before stabilization?
 - What related issues do you consider out of scope for this RFC that could be addressed in the future independently of the solution that comes out of this RFC?
+
+# Future possibilities
+[future-possibilities]: #future-possibilities
+
+Think about what the natural extension and evolution of your proposal would
+be and how it would affect the language and project as a whole in a holistic
+way. Try to use this section as a tool to more fully consider all possible
+interactions with the project and language in your proposal.
+Also consider how the this all fits into the roadmap for the project
+and of the relevant sub-team.
+
+This is also a good place to "dump ideas", if they are out of scope for the
+RFC you are writing but otherwise related.
+
+If you have tried and cannot think of any future possibilities,
+you may simply state that you cannot think of anything.
+
+Note that having something written down in the future-possibilities section
+is not a reason to accept the current or a future RFC; such notes should be
+in the section on motivation or rationale in this or subsequent RFCs.
+The section merely provides additional information.