The deadline  for unpeering lists will  be the distribution date  of release
1.5k. That is, you  can wait for release 1.5j to be out  to unpeer your lists.
You will then  be able to use  the Mail-Via= DISTRIBUTE function  on your peer
lists, so  it should  not be  a major problem  to unpeer  them (as  opposed to
Mail-Via= DIRECT which would cause major response time degradations).
 
  Eric