It looks like there already is a standard, and the Model S makes use of it (as well as the Leaf, Volt, et al).
Tesla is recommending that Model S owners either install an RV style 50A 240V outlet in their homes, or else install a charging station that has the Tesla connector that is currently only used on Model S. The Superchargers also do not make use of J1772.
If hotels end up installing J1772 and not Tesla charging stations, then perhaps Model S owners will use the J1772 adapters at hotels.
Fuck can we please get some international power standards for once ever.
A little confused, North America (or the individual countries) doesn't have a standard for side for gas.