I suspect the number of people who will cling to XP until the death will be sufficient to ensure drivers & software will mostly still be available.
I think you misunderstand the nature of the IT industry Sir.
You have to remember, at heart, it's a box-shifting sales-led industry where post-sales support always comes second.
Also of interest is what will MS do about activation?
I suspect they will probably turn off the automated activation, and leave manual telephone activation in place, during the course of the phone call you will no doubt be prompted by a nice chap in a far away country that you should perhaps think about upgrading to something newer before reluctantly giving you the activation key.