It surely is a sad state of affairs!  Can you imagine their loneliness?  They will always feel being a fake.
Perhaps, some of them disillusioned at seeing lot of prelates stay to keep their jobs and given up seeking God.    I think all seminaries should teach the seminarians the contemplative prayers.  There are ex-priest, ex-nuns, ex-bishops, we even have an ex-Pope.  However the old saying goes that there are no ex-contemplatives.  Once you build your inner silence, it always remains with you. 
In our relationship with God, we don’t start over but we always start from where we left off.