Well, it's a good inside joke. And the fact that Walt Jr. made it shows that his creativity and humor is as rampant as his father's.Not exactly official. I think Junior did that as an inside joke.
At the very least, you should try it out. And if it does well, it could very well become the variation of the logo for shows targeted towards kids and families.
I don't know, but it's a suggestion for the future.