lammert - 7:33 am on Jun 5, 2010 (gmt 0)

It depends on the member history. If these are members with no or only a very small posting history your approach will help. But with members with a longer history, especially a history with good contributions to your community you may first try to investigate why that member changed his/her attitude. Knowing the reason may either help you to create a better community, or safe a valuable member from leaving.