I believe the problem with CHAdeMO as the Tesla standard is that it can't handle enough current. One of the engineers said the connector pins are just too small, so there's really no where to go with it. My understanding is that CHAdeMO tops out at 70 amps, whereas Elon was talking about up to 120 amps IIRC. At the Boston store opening, one of the sales people said there was hope that the 85 kwh pack could be 80% recharged in half an hour by the time we get our X. It would be nice...
The reason they couldn't use the SAE plug is that the standard wasn't agreed till last month. Hopefully, there will be an adapter forthcoming from Tesla.
Yes, I know, and made the same argument myself. At the same time, I can appreciate the importance of a universal standard.