I too came to the same conclusion fairly soon after leaving, better to let sleeping dogs and all that. Many of my family that are still in are well along in years, they would literally have nothing in their lives if they left the Borg, I am sure that one or two of them would go utterly mad, they simply could not handle reality.
It is my hope that the younger ones wake up, those in their twenties and younger, but I don't hold my breath, for them it is a terrific social club, and eventually they marry a JDub and gain JDub in laws, and the cycle goes on, they in the end have too much to lose too if they leave.