“Could projected preachers create a dangerous celebrity culture?”
We live in a dangerous celebrity culture already. It just means pastors, and parishoners, need to be on their guard.

“Does social networking increase or impede our ability to function as the body of Christ?”
Yes.

“Could driving 30 minutes to worship cripple our ability to love our neighbors?”
It wouldn’t have to, but I think it often already does. I think the suburban cultural norm has become the driving to activities and creating community around those activities. These flavored communities are cool, except that they have been at the expense of ‘neighborly’ communities. This is probably more of an impediment to the mission of Christ’s body than most people realize. Folks are afraid to love their neighbor, unless it’s through some activity/program/structure. . . safely away from their ‘castle.’

Speaking of Community. Have you heard of “Crowded House” and the book Total Church
http://theresurgence.com/steve-timmis-total-church-lectures