While I agree I'd like to see expansion on the existing GW lore. I never played GW1....so maybe that's why, but I've never felt FULLY engaged in the GW lore.
The Elder Dragon's weren't in the original Guild Wars, only teased. They were created specifically for Guild Wars 2. I'm not saying they need to expand on GW lore in GW2, I am saying the need to expand on GW2 lore in GW2.