Mark my words. They'll be back. They may be gone for 4-5 years or so, but they will be back.
PC is just that irresistible. No amount of life can keep you away from it forever, especially not if you made any friends here. XD
I will say that a lot of the reason people try to 'leave forever' is over drama. It happens all the time on the internet naturally, so yeah, it's just natural.