Right, that was explicit. Wanting to be able to follow Aya to the US wasn't, though it's plausible.
Ah, right. My impression is that the Mitsuki-to-US plan is, at best, on hold. Joe's promise to follow Kanna poses the questions for the future of: when, how, and what about Mitsuki?
I've only ever seen the "going to America" trope in manga used as a way of temporarily removing characters from the plot--it's a little hard for me to imagine a manga endgame of "all the main characters transplant to the West and live happily ever after," although I'm sure it must have happened sometime, given how many manga there are.