They don't want an aftermarket for the cars because the batteries will wear out, essentially cannot be replaced, and you'll see lots of Teslas in the side of the road.
I still don't understand why these cars exist. You pay a premium that vastly exceeds the fuel savings vs a comperable gasoline vehicle. The warm fuzzy feeling associated with saving the earth is low value to me.
They also aren't magical machines that don't break. A guy on my campus bought one about 18 mos one and it's been towed (presumably to NJ or Boston) 2-3 times. There goes the warm fuzzy feeling about saving the earth!