Sure, but Meg was always headed in that direction. Barb and Arryn are different people. Barb's career is in no way dependent on OF. If she leaves RT, she's most definitely not going to go all in on OF.
When did either of them say they'd never do a candid collab set??? Follow Barb on social media, though I don't keep track of everything she does and care very little of what Arryn does aside from this and Rwby