I’m quite curious as to where they’re willing to take the series as bringing a de-aged or re-cast Luke is quite risky. Not to mention that if the Child joins Luke’s academy then canonically he would most likely be killed by Ben Solo. Unless they add some novel/comic workaround for it, but even if ts only implied I doubt they will risk that with such a popular and beloved character. Ahsoka would be less risky I think, and it makes sense as Filoni is involved, but of course then you have to introduce a “new” character as far as most viewers are concerned and it would also imply that Ahsoka chose not to associate herself with Luke, which raises many possibly interesting questions. They could of course return the Child to Yoda’s Species, but then they would of course have to go against Lucas’ wishes to never explore that species, and it could potentially be a bit of a cop-out. It will also be interesting to see how many seasons they’ll decided to stretch this idea as I doubt they’ll continue the series after Dyn has returned the Child to wherever that ends up being, even though the show is just called “The Mandalorian.”