I am assuming you still plan to do this, when is it being done?
Yes, the plan is to remove the Arrow Chat add-on. Sorry for that.
It's the add-ons to the Xenforo software which often cause headaches during software upgrades, and so can cost a lot up money to update (because it can take days or even weeks of work for PR's software developer to update an add-on). So to keep complexities to the minimum, the plan is to remove unused functionality.
If there were hundreds of members using chat, then it would be worth keeping. However, it seems that chat is more or less dead.
We are not sure of the upgrade schedule as yet. My guess is that it may take place in a month or two, but might be in a matter of weeks. I'll update you when I get more info.
Are you able to copy and paste your important pieces of chat?