At the end 8 managed to bring both her and Chang Lee back from the dead. She told him what she saw meant she wasn't scared anymore. Shouldn't that have been a comfort to him and his other incanantions after that ?. 8 was shown in TND and TEH so 11 must remember it. Yes he loses people and it is sad. When you fight a "endless bitter war" there will allways be casualties. 
However to know that it isn't the end they do go on to a final reward. Call it whatever you want paradise ,heaven. Dead does not have to mean totally gone. Especially in a time traveling sci fi show. Look at Dorium he lost his body and his head is stuck in a box. Yet he seems ok with his situation. Would love some clarity on River though. Is she back in the library or has she finally "moved on" ?. Hope so she deserves to be finally reunited with Amy and Rory in the ether. She would also finally get to meet grandad Brian and her " little brother" Anthony. 

However to know that it isn't the end they do go on to a final reward. Call it whatever you want paradise ,heaven. Dead does not have to mean totally gone. Especially in a time traveling sci fi show. Look at Dorium he lost his body and his head is stuck in a box. Yet he seems ok with his situation. Would love some clarity on River though. Is she back in the library or has she finally "moved on" ?. Hope so she deserves to be finally reunited with Amy and Rory in the ether. She would also finally get to meet grandad Brian and her " little brother" Anthony. 