If you are starting pre-med right now, then yeah they might be able to make plans. They have 4 more years of undergraduate to go, plenty of time for Dream Act to pass and get them green cards after 2 conditional years.

But heres where the reality hits: international students cant get into Med school.

Not even in Canada. Only rarely are 2 or 3 accepted, and those applicants are famous people. Either actors, sons of politicians, etc.