One explanation for why we had not made Contact was actually a question of the future of the human condition.  Many people theorized that as we, or anyone else, expanded our technology to the singularity point, we could leave our earthly bodies behind and enter into a new existence.  The theory said that everyone else had gone beyond before we met them.  Of course, we found it has not worked like that.  But many still speculate that we are on the verge of that change.