I can see the argument on the other side I guess if you assume that Nintendo would have to use their current teams to make a game like SotC and couldn't just throw money at a new team, but even with that said the counter is that Nintendo has one of the best selections of retail titles anyway so the difference wouldn't be noticeable if it won over anyone.
So how about this suggestion then? Nintendo should throw some money at a tiny team for 3 or 4 downloadable titles like Sony has done with ThatGameCompany and more recently Giant Sparrow. This could greatly help out their downloadable service which is easily the worst of the three when it comes to original content, and would be something they could just throw money at and some development device, doesn't have to take away from what they're already doing.
These smaller games have a lot of the same qualities that made Team Ico's games so unique, so that's why I thought of it.
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