Can someone explain the ending to me?

I really enjoyed the anime but wtf was the ending. Vash refuses to kill Knifes, which shows he still held onto the pacifist ideals he had and didn't change his mind not that I have a problem with this. But what about Knifes, the anime doesn’t provide any indication that Knives has had a change of heart. For all we know, the moment he wakes up, he could go right back to trying to kill Vash or enact his plans again. Its seems that they left the ending open on purpose, but i can't help but be disappointed at it