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Ham, Tidus Zanarkand is not the same as Yu Yevon's Zanarkand. Tidus does get this impression on the beginning after talking with Rikku but later he learns the truth from the kid fayth:
(SPOILER)Tidus and his city are just Aeons created 1,000 years ago by Yu Yevon to keep the memory of Zanarkand alive, untouched by war and time
Yeah, but still...
if Zanarkand won the war, Sin would still be loose. Yunascal would try to create false war to finish off what they started. Sin's destruction was to limit the technology of the still living people after the war so they would not, and could not, rebel against yu Yevon or Yunascal. the summoners were nothing but a show to keep the people calm and to keep order and hope.