"As for reasonable price.... well, no one but you knows what that reasonable price is."
So, you think that more than $60K (and that's lowballing a Model S's cost) is a reasonable price for a car for most people? If Tesla can build a cheaper, say around $30K, but still decent car with the same range and recharge capabilities, then they'll be in the mainstream market and not just the luxury market.
My whole point was that I think we are at least one major breakthrough in battery technology away from that reality because the power pack for the lower range Model S costs about $25K all by itself. Or at least that is what Tesla is charging for it as they charge $10K to upgrade from the 60 Kwh -> 85 Kwh battery pack.