I do agree with @Howdy_McGee on this topic. I'm also active on SO answering wordpress questions from time to time. In all honesty, most questions that is related to Wordpress is low quality questions, mostly plugin related, questions that shows no research or effort, questions where the answerer needs to do all the work.
One out of 20 questions might be a good one if you're lucky. Users are using SO to post all their crap as frankly they do not get any positive feedback from us here.
Yes, it doesn't make sense to have two platforms with the same content, but what are we going to migrate from SO. In my opinion, we have much better content here. Most answers to good questions are also very poor quality. Answers that are links or code only answers, answers using poor or outdated code etc.
My question is, if we ever are going to migrate from SO, what will be migrated. We must remember, there are plenty users on SO with no knowledge of Wordpress, which leads me to believe that the day that SO are going to allow migration that everyone is going to jump in and going to vote to migrate all that crap to here, all off topic questions and low quality questions.
With the amount of users currently helping with the moderation of this site, it will just be a matter of time before WPSE is in the state that SO currently is.
In my opinion, the following needs to happen
SO needs to take a stand on their own policies. Wordpress questions are actually off topic on SO as the SE stack have a dedictated platform for Wordpress questions
SO should not implement a migration option to WPSE. Who is seriously going to moderate what will be migrated and what not
The woocommerce stack should see the light of day. It is currently in proposal on Area 51. Should that pass, us and SO should have fewer questions posted about woocommerce which will take care of one of our biggest problems.
New users should be forced to read and understand the policies of the site they are posting on and should also know what the minimum requirements are before posting a question. Some kind of punishment from the system side should exist in the event that such users does not confirm the minimum. In all honesty, most new users posting low quality questions are blatantly lazy. They do not take time to research their issues and don't even try something. They use the SE stack as first option, and not the last as it should be. Most of them take on paid projects without even having the minimum knowledge and then expect that we do the job for them
We should all deal with our own issues. What I mean here is, the users that participate on multiple stacks should moderte and use the stacks according to that particular stack's policies. It is of absolute no use making SO's problem WPSE's problem and vica versa. I totally moderate the sites differently when I'm doing reviews on SO and WPSE as the policies differ on the two stacks
I hope all of this makes sense :-)