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What I would like is a few classes such a necro that are naturally antisocial to be a class designated as solo. There could be more as well but these classes wouldn't offer much to a group. In fact if they grouped they would provide the group with a experience penalty to the point it wouldn't be worth it. Then you would have your grouping classes who get a penalty for solo and get a lot better xp in a group. Actually these classes that are labeled group classes would have a hard time killing monsters solo that a necro would kill with ease.
The group classes would have a benefit of being able to raid, killing dungeon bosses etc. The solo classes would have benefits of being really strong, taking down monsters the group classes couldn't solo. But they would be limited to solo play and although tough enough to kill most dungeon trash monsters, they couldn't take the bosses down and would have a hard time with pack of monsters. Now the solo classes would have some dungeons tuned to them and would offer nice rewards and other content as well tuned for them.
I would expect most players would have one of each and that would be okay. I think this would be a unique game and could work. In PvP it would get really interesting. The group classes would be able to fight against a single solo class but one on one they would die a horrible death. The soloers would be like a small raid boss that the groupers would have to take down. Only one solo class could be in a battleground at a time waiting for a group to que up. The soloist "raid boss" in PvP would have strategies and henchman he could deploy as well depending what instance he chose to be a boss in would determine his dungeon/castle etc. This would offer the soloist a unique challenge as well as the groupers as in pvp they would both be doing what they like best .. soloing and grouping.
(Group Class) What would be more fun than fighting a real live raid boss? (Solo Class) What would be more fun than trying to wipe a large group of players by yourself?