Look at it in an economics way: Will they sell out at launch, and for the 6 months following, at $499? If yes, then it is not priced too high.
I firmly believe they will easily be able to sell every unit they can make for 6-12 months. Production will be the limiter, not price.
From an economics perspective, the 360, wii and PS3 (yes, even the PS3) were underpriced at launch, Supply could not meet demand. If we look at eBay, the correct launch price for those consoles was about $200-300 more than what they actually launched at.
I predict a special edition - like included game at the half-yearly point, and a price drop at the year, repeat as needed. This way you control demand to more accurately meet supply, and scalpers don't get a free lunch.
Patcher said as much on Gametrailers and I agree, I don't expect the price to stay that high but with that said what is the right price for an all in one device? If IP TV was viable service with access to the sporting events I want and the ability to get the channels I want al a carte I'd be all over a XB1 even if it was slightly more expensive than PS4.
On the Bonus Round again on Gametrailers they did a panel and part of the discussion was on subsidies tied to internet or cable which sounds interesting. If they can get the price down or bundle it in with other services that people already want they have a chance.