It's not as if industry battery technology was stagnant- everyone was developing plug in hybrids, but the rest of the industry was more constrained on cost. And Tesla has joined the race to a better battery.
Musk has really made a lot of mistakes in this game, and there are some that question whether he can actually dig himself out of the hole- from lack of real development to production problems- the hype at this point is more about good marketing over a good car. Someday, perhaps. But not right now.
None the less, nothing in his car is really innovative. And for that, I really don't understand why people put him on such a high pedestal. He's good, sure. Not great, and nowhere near people like Einstein.