You know what this would turn into? People are not going to mingle in any way shape or form, they're going to run amok and do nothing but advertise their own videos without a care for others.
Want to know how I know this? Look at the "Creations" section here on the forum, and find out how many of those posts that are recent have replies. Then look at those and figure out how many of those were people actually giving honest and relevant advice. I'll tell you how many to save you the time. Zero. Absolutely nobody cared to help the other channel for the sake of helping them out, while two gave simple comments that help for nothing and even more than that just plugged their channel asking for feedback.