The opposing console makes their console of choice better.
If Sony does something good, MS will try to one-up them.
If MS does something good, Sony will try to one-up them.
[spoiler]Gamesphere still reigns supreme though.[/spoiler]
That is all.
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I just wish Nintendo was still a valid contender. It would really mix things up instead of this two party political system we have...oh look I made a political commentary.