Yeah, I think all OMs with permanent ladders should be allowed. That includes past gen iterations of those formats, so Gen 7 1v1 etc. would be allowed. From what I can see, the tour circuit consists entirely of permaladder OMs and independent OMs (which is a subset of permaladder OMs anyway), so I think the rule would be consistent.
I'm not sure I'd want to muddy a fairly simple interpretation to keep Monotype Ubers, etc. but if most people think it should be allowed, then we'll do that too. (I am mildly concerned it'd turn into an outlet for people who make gimmick teams and quietly queue them in AG to have their posts stay up. For example, I doubt the person who posted in RMT recently is actually playing Monotype Ubers room tours. But this would probably not be a regular issue in practice.)