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Empyrean weapon (and relics) are unlikely to become the next best weapons. They are considered THE reward (with the AF3) of abyssea. It doesn't make sense to keep them going on after abyssea and after the next level caps. If the next great weapon doesn't come from a new endgame it would also kill said endgame activities seing as we are completely unlikely to see exceptionnal boosts on gear ( see : haste, attack, str all capping, easily and since forever, acc being useless since pizza exists).
I'd be completely dumbfounded if they stopped empy trials at 90. Mainly because it would be a completely idiotic thing for them to do.