When I was choosing options in June '12, I was astounded that every single Tesla employee with whom I spoke (local and HQ) tried to discourage me from getting the dual chargers. It certainly seemed like a company-wide policy. There was also much discussion on this message board, and I even convinced a few people to order it. The main reasons I got one were:
1) Resale value
2) For every time I needed to charge quickly (I figured once or twice per year), I would be cursing myself for not getting them
3) Tesla would be so revolutionary and it would create such a demand for PEVs that higher current public charging stations would become commonplace
4) It would allow me to carry my UMC in the car and not have to take it out when I get home
In the meantime, Sun Country has been quietly installing 80A J1772 charging stations in the US now. They seem to have made a deal with the Best Western hotel chain.
EV Trip Planner - Sun Country Highway
So much of this argument could become moot if their network continues to grow.