more accurately, the rebate 'fades away' - as the amount will diminish, then some more ... prior to POOF. The smallest model S battery, dual motor, fully loaded minus sound system will run you over $96K. Someone turned around and tried to return it the very next day. The offer from the dealer? $60k. You could get a nicely appointed Prime for the loss. .
i'm guessing a bolt will depreciate 5k/year, so to calculate potential used purchase prices, subtract $7,500. plus local tax credits from msrp and start there. i do think i spike in gas prices would reduce the depreciation though.
Hill is absolutely correct in that the rebates 'fade out'. But when you take out the rebates, the depreciation is about 25% for driving the car of the lot (and titling it). This does not seem all that unusual. Long term, luxury cars tend to loose about 50% in three years.