Re: The customers have changed OS and computing platforms..
That doesn't make much sense. Some folks have left the PC platform because it's not as easy to put a laptop in your pocket. Has less/little to do with the software when the physical form factor is just not as mobile.
I think a big reason for the sales not being so big is that people don't need to replace PCs nearly as often. I am about to refresh my laptop for the first time in almost 6 years(bulk of my computing is done on this laptop as I type right now, I have multiple tablets that never get used anymore and my Note 3 phone is really only for pretty casual stuff).
I expect the new laptop to last at least 5 years. The other 2 PCs in my house are also at least 5 or 6 years old(with no need to replace anytime soon). Other computing devices - my Tivo Series 3 is going on 8 or 9 years old at this point(I have a series 4 that is newer too), no intention of replacing that anytime soon either. My 47" Phillips HDTV is the same age as my Tivo, no plans to replace that either. Only about 2 or 3 years ago I replaced a 11+ year old Tivo series 1(with the series 4). Series 1 still worked, just wanted HD.