I think it's a bad approach by the devs to design the game by opening this topic and then doing what the majority wants. What about in release when the amount of players are multiplied then they come to forum and complain they want a different pvp system? Are you going to change everything then?
There are basically two types of pvp systems: 1. theme park like WoW 2. open world with player looting.
If you go with option 1 I think this game will be short lived because you have a lot of competitors, and WoW is still probably the best theme park tbh, will be hard to compete with them, the only thing you have over them is freshness of a new game and that won't last long. But even if that's the case, majority of players will want a theme park, so you will get a lot of players complaining if you don't go with option 1.
Option 2 is somewhat niche but at least there aren't so much competitors.
Are you a dev team doing this only for money or out of passion as well? Making a game you yourself would want to play? If it's not just about money then you shouldn't be asking if we want theme park or not. If it's just about money then i don't know what is better. Maybe option 1 is better short term and option 2 is better long term, but option 2 must in that case be chosen from the beginning not after the players who wanted option 1 leaves to go back to WoW.
It is easy how to deal, the players who want to play open PvP can just click on a button and activate it. The players who doesn't want to play open PvP just don't activate it. Or separated PvP Servers.