The price over earnings (arguably an imperfect, but better way to compare stock prices against each other than using pure revenue) for Apple has been fluctuating within about a factor of 2 for the last 20 years. Since before the iPhone, people were nervous about the possibility of sustained growth of profits of the company, and the P/E was similar to today. Once Apple started making a lot more money under Tim Cook, the price was at a relative discount becauee 10 years ago people were certain (but wrong) that this run would end soon and badly. The long term stability under Cook was truly impressive. Lets see what the markets think abiut the leadership change tomorrow, but probably this is not an immediate event.