You're right - it's probably
You're right - it's probably better environmentally to hang on to your existing vehicles until they wear out because of the embedded energy in the vehicle and the energy/resource impact of replacing it with a new vehicle.
The 2013 Zero S has an option for CHADEMO fast charging. If CHADEMO chargers become widespread in your neck of the woods, that can become a great option for fast charging. I think, however, that Terry made it harder than he had to. Rather than that set of five chargers, he could have gotten a single Manzanita 40 amp charger (the same as I have on my electric car conversion) and gotten up to 8 kilowatt charging rate off a single charger. One thing about electric motorcycles is because the battery pack required for the same range is smaller than electric cars, the normal J1772 charging stations can act as if its a fast charger.
Whether fast charging degrades battery life depends on the chemistry.