It will be interesting to see if Microsoft follows a Yahoo like trajectory - and if Apple follows Microsoft's trajectory after a few years of Tim Cook.
I would bet on it. This seems to be the cycle of tech companies: Innovate when small, rake in profits for years, lag behind, and slowly die. What has Apple produced under Cook? A couple small improvements to current products, and nothing new or noteworthy. There may be a couple innovations still in their incubator from days past, but in 5-10 years people will be saying the same things about Apple.