Yeah, I was kind of assuming Mia gets stuck in the past to facilitate Laurel and Dinah not being old ladies.
Besides, they'll probably want the spinoff to do the crossovers expected of the other shows so it makes sense to set it in the same timeframe.
That's what I thought too but Guggenheim confirmed last month it takes place in the future.
Green Arrow and the Canaries Will Take Place in the Future
I have no interest in the Arrow Kids 2040. I found all the segments with them in the future boring. I wonder if there is any meaningful interest in this show.
There came a time when the Old Gods died! The Brave died with the Cunning! The Noble perished locked in battle with unleashed Evil! It was the last day for them! An ancient era was passing in fiery holocaust!
Earth 16 seems to be the spinoffs home.
Oliver tells Diggle to make sure the kids make it back to 2040, so best guess is the Canaries do that and then get stuck there.
Though the 2040 future we've seen will be an alternate one if Felicity makes sure that William and Mia are never separated per Oliver's message via Diggle.