Since when has contrary evidence stopped players advocating pet cards? They still ask me for Bloodbraid Elf, despite my addressing them several times.

I think the card keeping Preo on the banned list, if any, is actually Sleight of Hand, not Opt. Preo is a strictly better Sleight, and I can’t imagine decks would play both instead of a Serum and Preo combo. So Preo would straight replace Sleight and make that card obsolete, which does not lead to any kind of net diversity gain. Since Modern looks good right now and Sleight is a played card, I doubt Wizards touches Preordain.

It’s possible that in different shells I would have had different results. When Preordain was axed it had always been played alongside Ponder so we never had a good sense of it’s actual powerlevel, though we know just how good Ponder is thanks to Legacy. If any banned card is guilty by association, it’s Preordain. I’d like to see if it’s actually worthy on its own, though like I said Opt makes it less likely.