I could see my household being 33%. We currently have three cars. I plan on replacing my mustang with a Model S (probably will be sometime in mid 2013, depending on where the 40KW models fall in the reservation production run. My wife's grand am is going to need to be replaced before then, but we are kind of stuck on this one, as there is not an EV option on the market that will fit her needs (the volt is to small, the leaf is to small and does not have enough range in winter with the heater on to make her round trip commute) We cannot afford 2 Model S's (we can barely afford 1), so we will probably be forced to buy one last ICE for her (she is currently leaning on the honda CRV) The model X would be perfect for her, but buying that would mean that my Model S does not get purchased, and the wait is to long, as her car needs to be replaced in the next 12 months. I will still have my old trail blazer, and will likely keep that as a vehicle that does not get driven much, for the 4-5 time a year I go camping and need a real off road vehicle.
If an affordable EV solution that has enough range to always make her 60 mile round trip commute, and that has room for the Me, the wife, the baby, the stroller, and the dog comes out in the next 12 months, we will be 66% electric when my Model S is delivered. I am hoping that I can hold onto the trail blazer long enough for a truly off-road capable EV to come out to replace it. If I could buy EV's to meet all of my family's needs, I would drop the gas altogether in a heartbeat.