How would they even nerf traps? If they go after floodgate, there's still canadia and fiendish. There's the trio of the -1 traps, ballista, karma and raigeki. After that there's stuff like WoD, drawning, bad aim. And we haven't gotten to D prison, Widespread ruin and armour. And there's also niche cards like memory lapse.
Just put FTH, Canadia, Fiendish Chain, Ballista Squad, Karma Cut, Raigeki Break, WoD, Drowning, Bad Aim, and Dimensional Prison to Limited 3. All of those.
Only if they will ever do that. Life is so good when you can always play a deck with 10 broken traps. Konami got no intention to limit them and force me to buy new cards.