When it comes to influencing others there is a real difference between "leaving" and being kicked out. These days, the way a DF'ing is announced leaves it open for speculation that you might be anything from an apostate to an armed robber.
The ideal 'leaving' (wish I'd done it this way) is to write a concise DA letter packed full of vitamins and minerals. Send it to the the elders and also to every member of the congregation who you feel might read it.
This could be of great influence on some.