One issue we have on Programmers.SE is that people like to have extended discussions in comments on answers and questions. Try as we might to delete long comment chains and educate them about chat (example 1, example 2, example 3, example 4, MSO example), our chat room sits relatively empty and long comment chains still occur with great frequency.
Presumably, this problem also occurs on any Stack Exchange question that invites differing schools of thought about a problem.
Rather than continue to fight a losing battle, can we get a "migrate to chat" option for comments? This would allow people to have their extended discussions in the correct place and expose chat a little more to the people who would most benefit from it.
The artifact that could be left behind to let people know that the discussion has been moved to chat could be a comment from Community:
The extended discussion in the comments has been moved to chat.
Where the word chat links to the permalink where the comments were migrated.
There's a case where this resolution would make continued discussion inaccessible—when a user is participating in an extended discussion on his own question but does not have 20 rep—but perhaps a warning or disclaimer could be added:
The extended discussion in the comments has been moved to chat. To continue participating, you need 20 reputation.
Or some logic (like perhaps a special-cased chat room) to allow the user to continue participating in the migrated discussion.
- A similar feature was requested for closed questions, but this request is extended discussions about things that are on-topic, but just don't belong in comments.