I think you're forgetting the fact that PC gaming enthusiasts are in the minority for the games market and for the PC hardware market. The businesses really don't care if they're going to have to stop producing to us as we make them such a small amount of money compared with the prebuilts the supply and sell. It may not be a nice thought, but we not a market worth catering for.
I do realise this yes. I think I mentioned that I'm aware MS have bigger fish to fry than PC gamers, but still there will be a loss. Fair enough if it's a tiny number. I don't know the facts, but I do know plenty of gamers that use Windows over the opposition due to games.
You're probably right as for every PC gamer there is a call centre or something using 300 copies of XP
I guess we just don't know and will all have to see how things pan out.