I don't think it's a poor fit. As long as it's done right. I was one of the people asking for an expansion not so long ago. At the moment it seems very thin on the content side of things. For me, the most important part of an expansion is that there is a big chunk of content. Sure you get the extra features like a new profession, talents and things like guild housing but there needs to be a decent amount of content. One thing that has driven me nuts over the last couple of years with GW2 is that there hasn't been any big content releases. There have been lots of little ones but I want to feel like there is a whole new continent to explore.