Some folks are pretty hilarious.
I've read something like: Next banlist dragon spirit of white / WoD.
I mean, why not? It's actually a good possibility, but, does it even matter?, let's say you buy 3 WoD(s) Right now or 3 Dragon spirits of White. When their nerf actually happens it's going to be February 2019 XD!, that's a lot of time to farm as much gems as you want and keep buying WHATEVER DECK YOU WANT TO.
But if you are going to tell me you can't farm enough gems in 4 months and that the game is such a "cash grabber", bla, bla, bla; then it's pretty evident that you are just hating the game and being a troll/n00b xD.
F2p can buy Vampires, the current top deck.
Geargia, SSA, BatteryMan, NK, Gemini, Inzektors, you just need gems, since HEROS were released you had plenty of time to get those gems.
I think limiting Vyon is unreasonable but it's better than semi-limiting him. Since semi-limiting Vyon will 🔥 the deck completely because you will either have to pick vyon or Celestial. I'd rather have 1 Vyon than 1 Celestial imo!!
If Vyon is semi-limited instead, I'd rather run 2 Celestials lol.
Destiny Hero Anki decks are just fine with 0 Vyon. I know, I tested a build that used 0 Vyon. My monster lineup is just 3 Drilldarks 3 Deciders 2 Celestials. I go with 8 monsters 6 spells 6 traps and run Balance skill.
Vyon is really good, but I agree that you don't have to have it in order to win. Probably easier now with less power to fur and amazoness. I have a couple variations of the balance deck that has witchraider instead of vyon and it got me to KOG.
Vyon isn't the problem Anki is or Decider + Decider endless defense wall. Limit those not this small harmless card. Fusion is nearly dead outside of Cybers and Gears anyway.