Why don't you come join my party!

Here's something I've been pondering on recently: At what point did RPGs drop the player being in sole control of a party of adventurers?

Granted I can understand that RPGs are designed to be purely played through the eyes of a singular character and people would rather prefer an investment (both time and emotional) into one character rather than having such an investment spread across multiple characters. But I do miss the days when you can create a bunch of characters and take them across a journey spanning many, many hours of game time.
It's just like being a father guiding one's children: You create characters, you stay with them through thick and thin, you get worried when they get knocked out, you grind your teeth when there's this one guy who can't hit a barn door (there's always one) and you cheer when your dudes complete the game triumphant. They are six guys you created who each need care and attention to get anywhere and it;s your job to get them there.

I can't think of when the idea was dropped. Baldurs Gate may be last game I can think of that employed the traditional D&D six man party and even that had a structure that required participation from NPCs - well you could create a complete six man party but only one will be required to carry the narrative all the way through.
And whilst there have been party-based games like Mass Effect, Dragon Age and the Final Fantasy games they don;t really count because you have a selection of party members available - if you don't like someone you can not choose to use them. Its not the worse idea but there's something satisfying about having a character start out useless only to eventually turn out awesome.

Considering the processing power of gaming machines these days it does raise the question of whether this idea will be revisited. Both MMPORGers and Divinity Original Sin has proven that RPGs can work with multiplayer and people will eagerly embrace such an idea.
Besides, who wouldn't want to create multiple characters and go with them on every step through an incredible journey?