Commenter DFooter writes:

As an entrepreneur that has started three tech businesses in the last 15 years, I have yet to hear of anyone who chose not to go out on their own due to health insurance concerns. I think this is due to two factors: most entrepreneurs are young and don't need insurance, or they are married and their spouse has insurance (my case). Because of the individual mandate that will force everyone to have insurance, I think that, at least in the tech industry, Obamacare will decrease entrepreneurship, as the young people who start most tech companies will now have a large, unproductive and unaffordable expense in paying for generally unneeded health insurance. That cash would otherwise go towards productive business building activities.

I hadn't thought of that, but it's at least plausible that having to buy insurance if you do strike out on your own might encourage younger people to stay in the corporate nest.