Whether the forum standards are re-equalised is more a less a matter for the free market. If OPs use RDs frequently, then we'll moderate to that standard. But given the default is non-RD, it would certainly seem likely that those threads and the accompanying moderating standard would remain the same.
Personally I'd probably prefer a few more RD discussions, remembering that the use of RDs under this proposal is slightly different to how RDs have been thought of in the past. Theoretically speaking, there are currently three standards; the Tavern standard, the default Chamber standard, and the RD standard, which is supposedly even higher than default Chamber. Default Chamber is roughly what OT was before the split. We are seeking to retain the default Tavern and default Chamber standards, essentially, eliminating that higher RD standard that is currently not all that popular. So the RD will designate a thread as subject to what is now the default Chamber standard. The RD standard has often been promoted as being about 'serious' topics and highfalutin debate, but the default Chamber standard is much more about moderating standards, and that's what we're going for here. Intervention for more derailments, trolling and personal attacks.
This is a little confusing, because it's both using RDs in a new context, and in a new manner.
I don't entirely understand JR's comment that he doesn't trust that the Tavern standard will remain default, because it is RD threads that will need to be designated as such. Without the deliberate use of that icon, it'll be the Tavern standard. How we moderate that standard is just as likely to alter now as it is with a merged forum.