[Perfectlap]

Why not? The Tesla was the safest car ever tested. Families are a big target for the Pana and Cayene. And Tesla owners are wild about them.
On the performance side, the 918 obliterated the production car record in large part because of E-power.
On the tech side, the typical Porsche buyer (in the U.S. at least) is equal parts educated and wealthy with a great interest in engineering and science... and gadgetry. If a small start up like Tesla can now sell as many Model S cars as Porsche sold cars in NA during 2009 economic crisis, then surely Porsche can whip up something great too.

p.s.
The cost of battery replacement will fall dramatically in the near term. The capacity is increasing quickly, the size of the batteries themselves are shrinking and intense competition in the market from Asia will commoditize prices just like GPS devices, digital cameras and smartphones. You'll be able to buy a spare electric car battery for peanuts before you know it.