As for, say, Jerusalem under an Arab flag, what date do you have in mind ? I am thinking a year is too embarrassing (i.e. what if it does not happen) and you would find 50 years too depressing. I would suggest 10 years as "pretty soon but hard to disprove".
Judge orders Jerusalem Gay Pride attacker to undergo psychiatric evaluation (Haaretz)
from the article: Hamas defeated IDF in virtual warfare during Gaza conflict, study shows