Well, I already
made the case as to why Tesla's PR stunt with locking Superchargers out of common public use is one huge, gaping, massive, and jaw-dropping "F**k-you" to other EV owners, putting a huge wedge between Tesla and non-Tesla EV owners in the slow-and-frustrating deployment of necessary fast-chargers...
There's never any technological reason a charger capable of charging one lithium battery couldn't have an emulated-interface adapter installed to make the Supercharger "think" it's talking to a Model S, but actually pumping power into a LEAF's CHAdeMO port.
That just requires two things:
1) knowledge of the CHAdeMO protocol
2) knowledge of the Tesla protocol
Just like what's been done with the
Open-EVSE project.
Then, build a mechanism that presents a Tesla on one side (that plugs into the cable), passes the raw DC contacts through to the LEAF, and emulates a CHAdeMO unit to the LEAF's interface. The emulator-adapter would basically just be a cable/unit with a QC plug on one end and a Tesla socket on the other, with a box in the middle handling the interface.
So, the question is, are those protocols known yet?