$1000 is a good number for me. They need to have the ability to price their highest product at any price point they wish, otherwise it will signify the start to the race to the bottom. The graphics card industry is starting a slow but long decline, price stagnation is just going to finish them faster.
So what about the average user? Plenty of graphics card from the 7770/650 to 7850/670 which provides a lot of value for money while maintaining the profit margin for both companies. Do realise that if they are going to sell Titan at $550 then their next generation of graphics pricing will be handicapped. Take i7 920 for example. Released in late 2008, for an "affordable" (in the loose sense) price of less than $300, many are still using it now in 2013. Still plenty powerful enough for usual tasks, many users have been delaying upgrades even when the 3570K is at an attractive price of $230 in Newegg (lower with discounts), or even $99 in specific 2500K sales.