I think this idea isn't what we need for LG.
But it's going in the right direction.
LG needs more active users, but it doesn't need to lose the slightly less active.
Maybe if you haven't been logged in for a period of months?
3-6 months. People leave and come back all the time.
I'm a great example of that. I left for a long time, and I used to just lurk around.
Yet now, months later I'm posting and being active.
I even referred a user to LG, increasing our user base.
So banning people for inactivity in my opinion is not the way to go.