ask Fisker Karma owners. At least in case of Tesla one can expect a robust cottage industry to quickly spring up, not just one small shop of former Fisker engineers which will bleed you dry.
Tesla delivers more cars in a few days that Fisker did in their entire history. The two really wouldn't be close in either demand or supply for ongoing servicing.
I have to ask the question, why isn't there one already in that case? Is everyone really putting up with the high pricing and very long parts delays reportedly associated with repairs the OEM experience entails?
I am assuming there is some copyright thing going on. There is also not much pressure for Tesla owners to look for alternatives as long as Tesla is around so the potential volume is low.
