I don't want my children living at home into their twenties, never mind their thirties.
I did "evict" my eldest son in a sense. He split up with a girlfriend and we, naturally, welcomed him back home, but he was lazy, disrespectful and downright disruptive so we told him to shape up or get out - he chose to leave, but if he had continued along that particular path his belongings would have been on the path outside.
I think it's only right to raise your children to be self sufficient and indpendent enough to want to leave home. That's the plan, and it's working fairly well, so far three have flown the nest, one is currently planning to leave and the other two will hopefully have followed suit in the next five years or so.