They have been moving on for a long time. Some are going to Continuing churches, some to Rome, some to Orthodoxy, some to other places in the world-wide Anglican Communion, and some to Protestant churches. How it's all going to shape up down the road is a guess.
It is beyond words to me that anyone can stay in a certain faith where the leaders (ie Spong) openly rejects the basic tenets of Holy Scripture. My former parish is still fairly strong, but it is in an urban area where the residents think they are slightly intellectually superior to the people in the suburbs. However, I must say the church has lost many long time members.