To add one thing:
"Enjoy your Happy Ending O'Fated Children, for time... it will not wait... no matter how hard you hold on, it escapes you. Fate, you can not escape it. The War of the Witches is coming. Let the Witch Hunts begin... Starting with Sorceress Rinoa. "
We know that witches were eventually persecuted, but considering that Rinoa is close with the president of Esthar, a high ranking General of Deling and the commanding officer of SeeD, it seems highly unlikely that even IF persecutions started properly within Rinoa's lifetime, she'd be at all effected. I mean, hardly anyone actually knows she's a sorceress to begin with.
Further, the persecution of sorceresses is a great background for Ultimecia, but there's nothing that indicates that it isn't simply one of Rinoa's successors who is persecuted. Especially considering that Ultimecia (who is the one persecuted mostly) lives too far into the future for it to be Rinoa.