They could be really slow about making changes. Like $1000 a month - that would sting a lot less than $5k over a few days.
They could refund the difference dropping 5% per day for the last 20 days.
If they did both then $50 would be the daily risk. And no one would complain about $50. I calculate the first year's depreciation at about $50 a day.
And I don't know about #1. While it doesn't matter to me (2015), I know of someone who purchased a car in the last 6 months and had a life change and needs to sell. They just lost $5k.
And I think everyone appreciated this is technology. But it is also a car. And buying a BMW has less short term risk for those on the fence between Tesla and BMW.