Lack of standardized plugs and payment methods are headwind for EVs. The J1772 interface assures companies like Walgreens and Simon Property Group, and employers everywhere, that if they put up a charging station all EVs can use it. It also assures would-be EV customers that they can plug in at any charging station. This is a very good thing, and much better than the Avcon vs. paddle, vs. small paddle charging situation back at the turn of the millennium.
Now, we need the same standardization for DC fast charging.
P.S. I am glad that Tesla does support J1772 with adapters for its cars. I wish they would support it directly, without adapters as well. Perhaps a Model S option to have SuperCharger connector on one side, and J1772 on the other.