How so? There's nothing in Revelation regarding the timing of John's death.
Does not Paul teach that Jesus will destroy the antichrist - the man of sin - upon his return to earth?
Indirectly, there is. It says it was penned while John was in exile on Patmos. We know from numerous Church fathers, Irenaeus and Eusebius among them, that Yochanan was exiled to Patmos during Domitian's reign. Therefore, the Apostle couldn't have died before Domitian's reign and was around in the 90s AD.
You must have John dead around the time of the destruction of the Temple. Otherwise, your position makes no sense.
He didn't die at that time if the datings of the general epistles (inroads of and fight against gnosticism) has any validity.