While I can't imagine APPLE lowering 16GB 3GS's price to $99 at next year's launch, I can't imagine APPLE pricing next year's NEW iPhone at $299, either.
APPLE will most likely price next year's iPhones at $199 & $299 again, and that leaves 16GB 3GS becoming a $99 iPhone next summer.
APPLE will most likely price next year's iPhones at $199 & $299 again, and that leaves 16GB 3GS becoming a $99 iPhone next summer.