I am about to make some generalizations based on my experience and the experiences of colleagues.
My experience has shown precisely the opposite. Homeschooling, when done well, produces individuals that are better equipped to meet the world and its challenges than "traditional" schooling. Instead of being surrounded by individuals of one's same age (and, often, one's same race, social status, etc) the homeschooler learns how to interact with people of all different ages, and adults in particular. Most homeschoolers I know actually spend more time at the local school, theater (stage, not cinema), library or college than they do at home.. Respect for adults, something conspicuously missing from many young people these days, is the norm among homeschoolers.
To say that a "traditional" school is the only way to get a grasp on society is preposterous. This is not to say that homeschooling is failproof; I have also known homeschoolers that completely fit the bill of the sheltered and socially-backwards. Pointing to these as the standard of homeschooling, however, is akin to leveling any other group of people to their lowest (but loudest) population.
Finally back to the topic, I can see this sort of online schooling to be an asset for the homeschooling community. Again, if used in isolation, it will almost certainly result in awkwardness. Homogeneity in ethos and context inspires only lethargic lemmings. I would submit that traditional schooling is the actual socially restricting option.