It seems as if people are missing the point. Anyone saying "they would keep prices at $500" isn't making any sense. For example, the reason Nintendo cut the price on the Wii is because Wii sales were falling, not because the HD consoles were taking over. That has nothing to do with marketshare, Nintendo could probably care less about it. They hardly receive any third party support as it is.
I voted yes.
MS has done little to respond to the PS3 slim / price cut of late, though it's still hard to know if they place more value in extra profits, or second place. It should become clear to us later in the year...
Thanks to the 2009 holiday season, Sony has secured enough momentum and marketshare that it no longer matters. 3rd parties are forced to support it along with the 360. Cutting the PS3's $300 price tag any further seems like overkill, they've lost enough money on the system as it is, it's time to make the climb back up.
If figures like this are accurate, it takes 4-5 game sales per console to break even when taking a $50 loss on hardware. That's kind of a lot...