He didn't place sole blame on third-parties, though. If anything, the lack of Nintendo software was a direct response to third-party cries about having to compete with Mario and Zelda. Nintendo gave them them an opportunity to have an open field early on, but they didn't capitalize on it because the install base wasn't there. That's usually how it goes -- third-parties don't want to compete with Nintendo but they won't throw significant support to a platform unless it has already sold well.
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Simplicity is the ultimate sophistication.