Using Konami logic, this is what I think the banlist would look like.
Banned:
Card Destruction
Gateway of the Six
Mind Control
Monster Reborn
Limited:
Dark Magician of Chaos
Inzektor Dragonfly
Hieratic Dragon King of Atum
Wind-Up Carrier Zenmaity
Semi-Limited:
Debris Dragon
Rescue Rabbit
Dragged Down into the Grave
Skill Drain
Unlimited:
Marshmallon
Summoner Monk
Level Limit Area B
Magical Stone Excavation
Explainations:
Card Destruction: Mostly a DW hit, since it allows them to do a lot of shenanigans in a single turn.
Gateway of the Six: WORST CARD DESIGN EVER I SWEA-anyway yeah the ability to make Shi En and Naturia Beast/Blade Armor Ninja IN A SINGLE TURN should not exist.
Mind Control: It wasn't bad card design at the time, but power creep has really made this card dumb.
Monster Reborn: We have 3 Call of the Haunted, which is a slower, more balanced version. Do we still need Reborn?
DMoC: Monster Reborn and Dimension Fusion would both be at 0, meaning it can't fetch those spells to re-summon itself over and over again, which I believe is the main reason it's still on the list.
Inzektor Dragonfly:Hornet would make more sense, but with the whole Zektkalibur Sword OTK flying around, Dragonfly is the one in need of being hit. Hell, I think Sword needs a hit too, just to make sure the OTK won't work at all.
Atum: Gets rid of the Hieratic OTK/Loop.
Wind-Up Carrier: Gets rid of the Wind-Up Hunter Loop.
Debris Dragon: With Plant Synchro completely dead, why couldn't this come back to two? It's a tuner with like 60 different restrictions on its own, and it could also promote Xyz's and stuff.
Rescue Rabbit: Rabbit is part of two relevant decks in the OCG (Gem-Knights and Dimension Laggia). This would be more of a consistency hit than anything.
Dragged Down Into the Grave: Again, a consistency hit for Dark Worlds (plus the whole hand peaking thing is kinda dumb).
Skill Drain: This is more of a guess than anything, but considering that the last 2 YCS's were won by decks that ran Skill Drain (2 Skill Drain decks made the top 4 in Long Beach), Konami MIGHT hit this one way or another.
The unlimitteds should be obvious. Summoner Monk for the promotion of Xyzs, and the other 3 shouldn't even be on the banlist anymore.