Highly unlikely. I believe that Trump Industries is a corporation, and if that's the case, then Trump would have to sell his shares in order to extract himself completely as an owner. Doing that is usually a taxable event. There are workarounds available, but someone would have to pay the tax (Trump himself, his Organization, or someone else).
No, that would defeat the purpose of the blind trust in the first place.
Unsolicited advice from someone who used to regularly buy and trade Magic cards for profit: If he still wants to get out, he should spend the time trading his collection up into cards people are willing to pay sticker for. Cards like Power 9, Imperial Seal, etc.; really, any card that is on the never reprint list that costs $200+ would be a good investment. Also, I hope he didn't try to sell his collection to a store--they always buy low (50% at best)--so his best bet would be to connect with someone on MTGSalvation or another Magic forum and meet in person at an event or con.