No please. I play mmos precisely because they are not single player rpgs with companions and parties to manage. I don't want an npc companion, but it would make you stronger so I would pretty much have no choice. Imagine if you could leave everybody behind in dragon age and go fight a boss or whatever without them, you'll basically die. Everything is balanced around that and future gw2 content would now be balanced around it basically making your actual character, weaker. Not to mention the tiny social aspect gets killed off where all you have is a chatbox now, as others have said. Old content and areas, achievements, dungeons, that you can't do solo... okay. If you can never find a single soul who doesn't also need/want it (I doubt this), there are better ways for devs to make adjustments with far less resource devotion.