As someone who has frequented 4chan for nearly 15 years I don't think you want 4chan to die for many reasons. If 4chan is gone then all of the time people spend there will be spent somewhere else. Maybe the internet is too far gone to be significantly impacted, but I'd rather not test it.
Most of 4chan boards aren't really that bad though.
Most of 4chan boards aren't really that bad though.