trade in copies of XP to increase
Let's make one thing clear : if MS is not selling XP any more, then copying XP is not piracy and the company is not losing money. Well it is, but it can't complain about it.
I might even go a step further and say that somebody should sue. There is no technical reason to retire XP at this point, it is still compatible with current hardware and a large proportion of users have decided that it does the job well enough. Therefor, putting a stop to XP sales is tantamount to a refusal to sell.
Of course, that argument will probably never sail in court, but this is the first time that we have the case where the latest and brightest (Vista) is massively shunned by the market which prefers the old, clunky but functional XP. When XP came out, it was indeed an improvement over 98, so there was little question but to upgrade and nobody cried when 98 was "retired".
Vista is not an improvement over XP, it is an impediment and an intrusion into the privacy of innocents. People don't like it, people don't want it, and XP is still the order of the day.
By that reasoning, MS has the duty to continue selling and supporting XP since the market demands it does so.
I'm sure there's a lawyer somewhere that can argue this successfully.
Even so, the day MS stops selling XP is the day it can no longer complain about people copying it. It's the only solution left, and it'll be MS's fault.
I'm waiting for the day MS stops the authentication servers. If the current trend continues and XP remains on the market radar, MS will have one hell of a backlash.