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I wish to shift the focus a bit and move away from 'game design' which is the stickied 'Solo vs group' thread.
From a RL point of view, humans generally don't talk to strangers with no reason. Despite the advancement in technology of 'contact me anywhere', rarely do we see humans just walk up to someone and talk to them.
If we do it is because we want something from the interaction; I talk to cafe lady who wants my money and I need my caffine shot.
Humans want to be in the presence of other people but not actually interact with all of them. I go to bars with my friends and hang out with my friends. I don't go to bars and talk to someone I don't know; unless its staff and my orange juice is 30 seconds late.
Exception is if I am there with a specific focus on 'talking to strangers' like 'Singles Bar / Speed dating' but even then, there is that desire to get something (companionship) out of it.
Forced grouping in MMOs? Fine. Cool. Have at it.
But looking at how most people (maybe its because I lived in large cities most of my life?) live, don't expect a massive amount of people.
I've made sweaping generalization which won't apply 100% (Yes that ONE poster who's like 'but I talk to EVERYONE! ^__^ ) but that's how I view why forced grouping won't be popular. Pretty sure a professional in social / behavioural science can poke holes in my theory though. :P
Informing people about your thoughts and impressions is not a review, it's a blog.