Given that every indication we have is that the dragons mostly want to live in peace and focus on raising thier broods, I very much doubt they are going to instigate a war based on something abstract as "Hydaelyn lied to us" with people who had no control or influence over that.

They already did a thousands year long war based on revenge and are over it, and that was when the actions taken against them were much more concrete and directly malicious.