You're making a very basic assumption that companies strive for monopoly status as a primary goal. A race to the bottom does nothing for nVidia's share price so no, there will be no freebies from the green team just to make AMD bleed.
If nVidia has an ace with Kepler they will use it to make more money, not less (see G80). There's also the question of supply - you can only undercut prices so much until you can't meet demand.
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