MORE PRESSINGLY: DOES HE STILL ATTRIBUTE EVERY INWENTION ON EARTH TO A LITTLE OLD LADY IN LENINGRAD? But yeah, making him a kid was necessary for believability, since everyone knows he was the kid of the crew, but now that they've done it we must PONDER THE IMPLICATIONS/

Well, presumably old Spock or someone else is going to warn the Romulans that their planet has a ticking clock, MAYBE THEY COULD WORK TOGETHER? VULCANS AND ROMULANS? HELP EACH OTHER OUT? I doubt that'd go smoothly like at all but I can't imagine that they wouldn't try.