This was excruciatingly tragic and beautiful as well. What the hell is going to happen now, is it bad if i want the world to be destroyed as well? lol
Most of us already guessed what Eren's plan was all along, but until the manga ends we still don't know how exactly is going to end. By what Isayama said in some interviews i think it's still possible that he will come up with a way to save the world in the end.
Also, i'm glad the source of the Titan power was kept ambiguous.