Having played some MMO's including Guild wars (which isn't defined as a MMO anyway), I've come to the conclusion that the future of Guild Wars is rather weak. Please don't bash me since this is purely a personal opinion. Let me explain why. The reason Guild wars has been (and still is) a success are mainly due to these reasons; the beauty of the game in graphic sense, the well-balanced PvP part, the non-monthly-supscription-free system, stable and reliable networking system and nonetheless the skills which is the heart of the game. These factors have made Guild wars a known game in the Online gaming arena, however these factors alone will not keep the game interesting and immersive in the long run - even new continents and contents are being added for every major update/chapter. The major weak point of GW is the instancesation. This is the part where I in my humble opinion think Guild Wars will loose its stronghold. The future of online gaming is headed towards the openess, being able to travel to everywhere, to meet people on your travel, to fight with people or against them (yes it does sound like wow). The instancesation results in the restrictions that make players will leave Guild Wars in the near future when other games arrive. Why? Because more online games are getting better in graphic, they will look as nice as Guild wars, with efforts and a good implementation the PvP should be as good as in Guild wars, the networking issues will be handed better due to better technology and infrastructure and well-thought skills will also be possible. With these factors in place added with the non-instancesation nature any games could outdo Guild wars by margin - yes even it is a subscription based system.
What im trying to say is that I love Guild Wars, and these are my concerns since I really can't see any future for Guild Wars with the instancesation system. The world of Guild Wars as it is now can remake to be non-instancesation. Of course it will be a challenge but not impossible. A Guild wars without instancesation will k.o. any MMOs out there even WoW.
Many people in here will treat what i just wrote as nonsense and are happy with GW as it is. Yes, Guild wars isn't WoW, it wasn't meant or will be as WoW, but it doesn't mean it should meet it's doom by staying the same and stubborn course. The future is freedom, not instanced.
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The way that GW is structured is that it's much easier for people to get together with their friends - there are no server bounderies. Even if they're on another country's servers, we have international districts to meet up in. You couldn't do this if not for instancing; the logistics are a nightmare from where I'm standing. With no concept of "servers", how would each "copy" of the world work? How do people get together into the same "copy" (for lack of a better word) to party together? Sure, they could have to choose one, but then again, now you've got a bunch of people running around all affecting the world at once, and you end up again needing to break out into servers all over again. I might be missing something as I'm no network expert, but I think this was part of the point of instancing, to avoid server bounderies that stopped people from playing together. 