I know it's a long shot, signified by the two giant rainbows. Look at it as a what if.
Also I wouldn't expect them to all start kissing on the word go. But right now the door is closed. Open the door and see what happens.
The NijiMen would likely get collabs, even the two in the black screen stream. Enna would likely get collabs. You just gotta get the ball rolling.
It's mostly about the side effects though. Twitter interaction, the ability to enter tournaments and events, etc.
NijiEN is isolated right now. Apart from a few Indie and Stars collabs they have to keep to themselves and are being denied opportunities to mingle because meeting a former colleague, many of which might still be friendly with you, is a nono. Removing that restriction would already go a long way.
Again, to show I am not completely delusional about this: