This is when the charging station network will really take off as well.
500k is more than 10x current annual production, and though profit per vehicle may be less than their current models, we could still assume that they're preparing to ramp up 10x their size within a very short period of time. There will likely be enough profit or credit available to build more factories then - or perhaps take on partners that they build vehicles for. Could this lead their valuation being 10x what it currently is? Even 5x at what it currently is would put Tesla at nearly double the value of the suggested $75B purchase pricetag Apple might pay. It just doesn't make sense.
Also, it seems they're planning to supply houses, not just vehicles, with battery packs - so they could easily sell tens of millions of home and business packs every year within the next 5 years, at a much higher purchase price than an iPhone and with greater long-term savings.