Richtofen won't be replaced he is too valuble to the story line to get rid of. I say Takeo will be replaced. By who? Im not sure.
I can see where you're coming from, it's just in my opinion, Richtofen seems to have out-lived his usefulness. Don't get me wrong, he's one of my favorite characters, and I would hate to see him go, it's just seems like, ugh, i dunno.... It's almost like it's his time I'm guessing.
Well he hasn't really out-lived his usefulness with the quotes about Samantha. But I think everybody is on the same page about getting rid of Takeo. Takeo is alright in my book but like StopDrop said he hasn't been involved with storyline AT ALL. Richtofen won't be replaced but if he is going to he will always be a legend in Zombies. If we are going to see another character to replace Takeo I do have some people:
1. Luvding Maxis (If Alive)
2. Sophia (If Alive)
3. Peter ( If Alive)
4. One of the unnamed Marines from the older maps
5. Samantha (If Alive) ( lol jk jk )
And thats all the people who will probaly replace Takeo. If I have any more I will Edit this reply.