The problem is, of course, that there is insufficient data for us to know, statistically, about where previous home educated people end up. It would be interesting to compare outcomes for home edders against those for the general population, both in terms of qualifications and employment. But I don't think it can be done - there are just small surveys, which show much better outcomes, statistically, for home edders, especially if their parents had limited education themselves (bigger differential from outcomes among general population).
I just keep remembering how recent universal formal schooling is, even in the UK. Can we be sure that it really is the best thing for 99% of the population?
Can parents cope? Maybe not always. The ones I know can and do, though, and it's not all naice middle class professionals with degrees coming out of every orifice. In fact, few of the families we hang out with routinely have tertiary education at all. And the working parent(s) have a trade, or a small business, or are finishing a degree around the children, or have worked in the sort of environment where non academic skills are valued (e.g. Caring, gardening, animal welfare, that sort of thing).
Remember that we pool resources. There are all sorts of activities I would never think of introducing my children to, but someone else does, and sometimes it sticks and becomes really important to them. And likewise, I have interests and skills that contribute to the experiences of other people's children. ("but what if you are really isolated or don't get on with other home educators?" There is always a what if).
The child isn't abandoned to the wolves - the parent exposes them to all sorts of opportunities. But the child gets to not waste everyone's time and energy if something does not interest them. There's no point pushing people to learn things they are not ready for. It is hard, discouraging, boring, damaging. But if you wait till the person is ready and interested, they learn super fast. I've seen this recently with swimming. A gang of home edders go swimming every week together. At the beginning, one was a confident swimmers; two could swim a little; one could swim a tiny bit. Three months later, the tiny bit child can swim 10 metres cheerfully, two non swimmers are totally confident, the swim a little ones are now completely independent and safe in the deep end, another non swimmer can do a few strikes, and about five of them have learned to swim underwater, all from that one confident swimmer at the beginning. Oh, and a little boy who used to cling on to his mum the whole time he was in the water went in without her a couple of weeks ago, totally cheerfully. Not a lesson in sight, no adult agenda to learn to swim, just let's have fun in the pool. I think that, in so many aspects of.our culture, we've lost confidence in people's keenness and ability to learn, if they are given opportunity without pressure, and expertise on which to draw.