It won't,not until moderation becomes strict and tight. Spamming will only become more. There are downsides to his: More spamming, more work for mods, which would lead to more spending. You should focus more on the members who left this place(because they stasrted hating it). New members wouldn't get what bitcoin is for a while,and they would keep asking the same questions again and again.
Don't bother starting a youtube channel or anything would bring more population to bitcointalk,so long as things are bad here. If you start youtube, more things would become a "priority" then. First,try getting rid of current issues, this will only add up as a burden to you.
It works for 4chan and that places is a cesspool no better than bitcointalk..
Not an official channel that I know of but a lot of videos about what goes on there..
I think spammers come from people searching how to make money online..
People searching for bitcoin on youtube may not all be the type to spend countless hours spamming and chasing bounties for a few satoshis. They likely have lives, atleast somewhat, and would mostly reach English speakers..
I think it would be great along with a strong welcome message including a disclaimer of the pitfalls and perils real "interested in bitcoin" newbs could face here..
Answering questions about how to use bitcoin, how bitcoin works, how to follow your transactions in a block explorer, stuff like that, is a whole lot better than all the questions about how to get merit so they can make more money spamming, questions about bounties and "earning" etc..