Alternatively, I would like to propose that we should allow the OP to be automatically invited/permitted to join the chat regardless of reputation. Not infrequently a low-reputation newbie asks a question, someone answers, and precisely because the OP is a newbie, they have lots of follow up questions unworthy of separate questions or even comments.
I just saw an administrator shut down the "comments" section of an answer (with instructions to that said "[for] extended discussions, please use chat"). Problem is
Because comments were shut down, there was no easy way to inform participants with the link to the chat.
Because the OP was a low-reputation newbie, they couldn't join anyway.
So even though there was someone there willing to help the newbie, the system forced the end of the assistance.
So, I'd suggest two things:
Automatically allow the OP to be invited to the chat regardless of reputation.
Give us a button that allows us to create a chat immediately, rather than either (a) keep posting comments until you get the prompt to automatically create a chat; or (b) going through the cumbersome process of manually creating a chat room.
This way, as soon as it becomes apparent that this is a newbie discussion, give us the option of moving it to chat, unclutter comments with the typical inane newbie questions, but let the person who is willing to take the time to help the newbie to actually help them.