A long time ago, MMOs were text-based with no graphics whatsoever and were known as MUDs (multi user dungeons). During that time, forced socializing/grouping was the norm: almost everywhere require you to be in a group to survive, or to make any significant gains in gold or exp.
It was horrible.
It wasn't the social heaven that people thought it would be. You don't join the server and get lots of friendly people who are looking to group or socialize. Instead, the player population consists of closed groups of "elites" who already have their own group going and don't trust others, or clueless newbies. It takes forever to get anything done because you first need to find people to group with, then make sure those people know what they are doing or can follow instructions, and then make sure everyone has the time to complete the task. This would often fail, leaving you at square one with possibly hours of wasted time.
It greatly limited their audience.
If you can't find a group, and none of your friends are online - you can't play. If you're a new player, and none of your friends play, good luck trying to get anything done. Sometimes, you would get your friends to join the game, but because you had a head start, and because of all the barriers they put into the game, it is so hard to group with them. Good luck logging and playing for 15-20 minutes when you have the time - you'll probably need to spend 30+ minutes begging for people to group with before you can even start to play the game.
MMOs have evolved.
People realized that the smart thing to do is to instead give people the option of grouping/socializing. They realized that if people are grouping up simply because they want to gain gold or exp faster, then they are not really socializing or making friends. By giving people an option to go solo, they eliminated all the inefficiencies, inconvenience, and made sure that people who group are actually into grouping. Games like Everquest and WoW are famous for their huge, highly organized guild raids, and yet, one can finish the game solo without ever having to group. Many MMOs also realized that they need to give people the tools to be sociable: e.g. easy travel between location so you can meet up with friends, and removal of grouping restrictions so "old-bies" can group with newbies without penalty.
All in all, MMOs have come a long way from being closed elitist/snobbish communities that requires many hours of time commitment into a mass marketable genre.
Great post, I was hoping to get more responses like this that view the evolution in MMOs from another viewpoint. For me it's obvious the changes that have been made to MMOs but less obvious the motivation for making those changes. I remember exactly what you were talking about in Everquest. There were times that it was hard to find a group, especially when you were higher level. Usually though if you were a member of a guild it wasn't difficult at all to find a group. There were times where I waited 30 - 60 minutes waiting for a group but usually I would find something else to do.
For me questing is really boring. Specially the way they make it now a day with games like WoW. I spend all my time leveling looking at the map and running towards the area that is marked. I don't spend any time exploring or looking around i'm always being told where to go and what to kill and for how long. Maybe I'd like to sit down with a group and kill goblins at a game for a few hours. The auto-queuing for dungeons is even worse. I started playing another game recently called RIFT, very fun game, except i can't even tell you where the dungeon entrances are I don't even know what zone they're in unless I die. I played the whole game without even seeing 20% of the world because I could just teleport everywhere and spent the majority of my time in dungeons. The same applies to WoW, it's just boring and some of the new people don't even know half of the zones because they never had to go there.
Maybe the type of game I enjoy is more of the elitist/snobbish types but it feels much more like a grind when I have to run around doing quests. I never played the MUDs but I know in Everquest because the groups were very social, everyone but the person pulling the new mobs to kill was sitting around talking. You can hardly spend 2 seconds talking in modern day MMO dungeons or groups because they're so fast paced.