@spot-on, It should do well over time. Other great PS3 games have had similar early sales and went on to have long legs. Uncharted is a similar example I believe. This is why Sony has been able to keep the prices of some of their games high for a long time, taking a page from Nintendo when their quality justifies it (relative to other games). I could also see Killzone 2 becoming a bundled game if they deem the sales not good enough for its quality.
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It should do well over time. Other great PS3 games have had similar early sales and went on to have long legs. Uncharted is a similar example I believe. This is why Sony has been able to keep the prices of some of their games high for a long time, taking a page from Nintendo when their quality justifies it (relative to other games). I could also see Killzone 2 becoming a bundled game if they deem the sales not good enough for its quality.