personally i think it should be illegal to ship any software preinstalled. This would make it normal for people to buy whatever software they wanted. And it's no use saying 'most people won't know how to install yadda yadda' because if it was illegal, they would learn pretty quick how easy it is.
This would enable people firstly to choose what OS(s) they want and secondly to choose how much software they want to get too, and how much fuckware they want to leave in the shop. I believe this would revolutionise the software market, and it could only be good. I also think it would be the end of all software monopolies, since the compatibility/cross platform beast has almost been slain anyway