I don't think so. At least, not inherently. A "soloer" can contribute to multiplayer in a lot of ways: crafting, providing materials, figuring out gameplay mechanics, etc. Also, a world filled with players helps make a world feel alive in a way npcs cannot. I don't think that can be found elsewhere. Even ignoring all that, I've seen "soloers" party with people quite often. The "Solo" content can include content for 2 to 4 players which is what many of board games or card games use. At a minimum, carbine itself said "solo" content is solo+small group content. There is a problem here. "Dynamic" and "Difficult" have very little to do with the number of players present. Many "Dynamic" boss mechanics can be added to a solo or small group. For example, in Final Fantasy 5, there's a boss that one shots a party member, then tries to suck them to prevent reviving them. The entire fight is a race against time. That doesn't sound like the simple content I usually see mmos do for solo/small group. HP itself equates only to time. It doesn't really mean anything else on it's own. It makes sense that a mmo would want to keep fight times reasonable regardless of the number of players. (By reasonable, I mean a boss fight not lasting 8+ hours or 8- seconds.) I'm not sure there are any genres based purely on an individual player. Even console rpgs have tried adding multiplayer. Pokemon supported link-cables for as long as it existed. Golden Sun had a pvp arena option. Final Fantasy 6 has an option for 2 player support. Probably others, but that's what I can think of offhand.