Moose, I don't understand why you're in such a rush to find someone else. You have a new baby. If this is a happy thing (as it should be), you should still be enjoying the NRE of having a new family member. Having kids means you are supposed to put THEM first, which sometimes means putting YOUR stuff on the back burner for a while. You have your whole life ahead of you to watch your child grow up and to pursue your other involvements. Don't miss the forest for the trees.
To me it sounds like you're asking the members of this forum to give you "permission" to keep pressuring your wife about this. The answers folks are giving you are obviously not the ones you seem to have been looking for. If you want to get "permission" from MTV and YouTube, that's your prerogative.
I recommend that you read the threads here about "being poly with kids".
This is the general one:
This is the one that focuses on legal and custody issues but it might have links or tangents that are useful:
ETA: It might not be such a terrible idea to have your wife read this forum to learn about poly instead of watching the Frat Boy Network I mean MTV.