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eugene said:
Actually, the longer is a system is out, the attach rates usually go down. Its easier to have high attach rates with the less systems you sell. If you only sell 2 systems, you only have to sell 12 games, but with 14 million systems, you have to sell 84 million games.

You're mistaken.  Attach rate grows with the system's life, not shrinks.  This has been the case on every system in memorable history up to the last year or 2 of the consoles life.  At that point used game sales can hurt attach rate a lot (See: PS2).