Like you, I wonder what support is going to be like for my 2012, especially now that it's out of warranty. Two dealers I've worked with were able to perform recall updates on the electronics (with Zero's help possibly), but for a persistent front fork issue I had to get involved more than I would have liked (it ultimately was fixed however).
If you have a competent dealer close by that is bullish on electric motorcycles, then you are probably OK. But since there is no dealer near me any longer (and I live in Houston, 4th largest city in the US), I find Zeros hard to recommend to Joe average motorcyclist unless that person is also an EV geek.
It's too bad, too, because I generally feel Zero has a good product (especially in the 2015 models where the components have been upgraded). But they have to get more of their dealers knowledgeable and comfortable with the tech, and work out whatever communication and other issues exist between them and those dealers, before they will become mainstream.