The text-box in the last panel stating "He never made it back to Earth and floated through space for all eternity." says otherwise.
Actually, I checked the artist's other pages to see if they said anything about it. On their Deviantart, this is what they said about the whole thing (because about 90% of comments didn't like this situation, either):
"dont worry,The boy’s journey still continues. To be continued"
So, I imagine they're not going to just leave him like that forever. That whole "floated through space for all eternity" is most likely just a Jojo reference.