Harry did not have to think really hard. This was Hermione. She would not do anything without thinking it through. Besides he had every reason to leave, given the increase in public and Ministry pressure to enrol in the Auror program. Minerva wanted him to settle down, marry and become the DADA instructor. With Ginny stalking him and Molly turning banshee, life was becoming unpleasant in Magical Britain. If Hermione had not asked him to join her he probably would have moved to abroad, to America or Australia; anywhere far away Europe and Magical Britain.