This is a valid argument, and it isn't like AMD will not see demand for these processors at this price point... even if the 9700 turns up 5% slower or slow overall compared to the Q6600 and 10-30 bucks more expensive, the costs of MBs make up the difference more or less....
Add to that the capability of drop in upgrades and AMD will sell plenty of processors at this price... the initial demand will be quite high, because there are a percentage of users who simply buy AMD regardless for various reasons.