I don't want Kyurem to be banned
Although Kyurem is a strong Pokémon with a difficult-to-handle moveset, I believe it still has certain weaknesses that prevent it from completely dominating the metagame. Here are a few reasons why Kyurem should not be banned:
1.Major Weaknesses: Stealth Rock and Speed(base 95).
2.Reasonable Counterplay Exists: M-Scicor,M-Metagross,M-Lopunny,... etc.
3.Not Overwhelming the Metagame:
+Kyurem pressures teambuilding, but it is not unmanageable in battle. Common Pokémon like Mega Lopunny, Mega Scizor, and balanced bulky offense cores can keep it in check.
+Future Sight users like Slowking make it difficult for Kyurem to safely use Substitute repeatedly.
In conclusion, I think Kyurem is a big threat but not so much that it's impossible to deal with. Keeping it in the metagame would make PvP more interesting, rather than removing it.