People are so scared to answer hypotheticals, this may be part of the reason why getting good discussions going on this site is so difficult.
Amusingly, I think the exact opposite - that the biggest barrier to good threads on this site is that people refuse to speak in anything BUT hypotheticals - when I strongly believe that thinking in specifics is what makes you a good magic player.
But it's okay that we think different kinds of discussions are good. I hope there's room on the site for both kinds.
Hypothetically? I would absolutely cut Probe for a Preordain. There are a lot of other cards I would cut for Preordain, too. I would cut a Time Walk or a Windfall or a Mana Vault for a Preordain. A 1-of probe seems fine in the deck but there's not a lot of consensus when it comes to storm decks, and there's a lot of context we're missing.