I don’t see The Child and Ahsoka both being alive at the end of this series.
I can see them killing off Ahsoka, though I don’t think its necessarily guaranteed. However, I definitely do not think they’ll kill of the child. Considering how popular it is, and how upset people got from it simply being punched by a stormtrooper, I highly doubt they’ll be that bold. I think they’ll find some excuse to keep it away from the main events of the galaxy, probably reuniting it with Yoda’s Species which has stayed hidden so far in SW canon, or something similar.
I hadn’t thought about that, but now that I think about it, Filoni kind of already did that with the Lasats in Rebels. So it wouldn’t be unprecedented.
Plus, it would be pretty hard to kill off Ahsoka, considering that she’s now Death Proof.
“Death Proof”? Not quite sure what you’re referring to? She’s cheated death once, but that doesn’t mean she can’t die. I personally don’t think she’ll die in the Mandalorian. I think Filoni is saving that for whatever potential series will cover Ezra’s return, though it’s not out of the question.
As for the Child; it wouldn’t surprise me if at the end of the series they meet some members of Yoda’s Species that have a hidden planet like the Lasats, or maybe even from outside the SW galaxy, or…since Filoni has already explored other “Force-dimensions” like Mortis, the World Between Worlds, etc., it wouldn’t surprise me if the Child is taken to another “realm” entirely. And as already discussed here it’s also completely possible that Yoda’s Species will be revealed as the Whills or something similar.