Once the companies make it to the top and the founders step down, there's no reason to spend money on innovation. The ones left behind to run things are more than happy with their cushion jobs, as long as they just keep on collecting that money leadership isn't going to care. I would bet that there are many Microsoft employees who have a lot of great ideas for some new amazing tech, but the people running the show wouldn't even give them a chance to start up another project.
Here are the two products Microsoft has produced that the future will remember for a while, that is Windows and the X-Box. For apple it will always be their odd computer and laptop designs, and for of course the ipod and iphone, apple right now has the coolest brand out there. I mean look at the Ipad, I would say the reason most people purchase them is because of the brand name alone. The pad thing has been around for years before, and you can do a lot more with a netbook, but because it has some shiny apple glass and charges twice as much as a netbook the people with money buy it as a status thing. I bought one for my wife because it's what she wanted. Sony will always be known for their sound systems, televisions and of course their gaming systems.
Innovation gets us to the moon, however many people do not like change.
Where there's a will, there's a relative.