Actually, I think it's less. Blood grows thicker or stronger or weaker. And more that the previous generation makes way for the new generation.
We know for a fact that old races like the Trolls and the Elves are nowhere near as strong as they were at the height of their civilization, and probably never will be again. And I believe the Azj'Aquir is a part of that.
It's just that Warcraft seems imply that the older generation must make way for the younger generation, rather than trying to maintain or revive past glories. Which has been shown a lot throughout the story, such as with the Night Elf Storyline where they needed the help of the younger races to hold back the legion. Or the Troll storyline for Vol'jin where the Zandalari want to go out and recreate their past nation once again and being stopped.
It's less old is better, or younger is better. But more Old makes way for the New. As the Younger races are still growing into their peaks like the Humans and Orcs. And I wouldn't be surprised that should those young races actually reach their peaks like the Trolls, Elves, and Azj'Aquir did. That if they have a shattering of their people, that they too will forever be shadows of their former glory, and must make way for the next race or generation that would follow.