Not really, remember how everyone has compared Windows ____ (Insert your version here) to Apple and talked about how blantantly they copied ______ (insert feature here). Now, think about how many copies of OSX have been sold in that time frame versus Windows...
MS licenses to manufacturers. It's very rare for a single manufacturer to hold a majority of the market (see smartphone market, ie - Android beating iOS). In reality this has very little to do with the quality of the product. To borrow from Gates, as long as it's "good enough" and the manufacturer puts their weight behind (advertising, brand recognition, etc.). It is possible that while not killing the iPad, it could do the same thing to Apple that PCs did back in the day.
There's more than one way for things to occur. Some of it even depends on market factors which are exactly obviously connected to the individual products themselves, so all that to say, next year should be an exciting year in the tech world one way or the other!
