apparently you can use 3 zune's on one zune pass. So I guess your zune could opt out and the rest of the family could use the pass.
and to the other person.....thety won't kill zune 30 support for now. There is simply no reason to since the hardware is in some ways better than the newer flash based zunes.
When they come out with a major hardware update I could see some phasing out, but I bet firmware support in some fashion goes on for a while.