there's no reason to believe this generation wouldn't have grown up as fucked up as the last, if it weren't for yona taking them away. how many dragons before them must have been the same? authors that can portray the intertwining of love and hatred so believably are just great.
He was only 15 when the new dragon was born... Imagine thinking at 15 that 'Oh, I guess my life is already over'. I'm happy that he could live 12 more years at least.
I really reallly realllllyyy hope that they are the last generation of dragons. If they have to wait for Yona's reincarnation after she dies, the cycle will just continue, of hate and longing. I hope this time, yona takes all the dragons with her