You will be thrown into a medicaid type system should Obama care be implemented, that is my entire point. Employers will dump their coverage of their employees as it will not be advantageous to cover them anymore, it will be cheaper to dump them into a national program.
But there isn't a national program. The structure of of our health system in broad strokes isn't different from what it is right now: Medicare for the elderly, Medicaid for the poor and near-poor (the difference being that under the ACA, Medicaid is available to all of the poor and not just some, as is the case now), private insurance for everyone else.
If you're not in a group or employer-sponsored private plan, then you buy insurance (high-deductible, if you want) in the individual market, just as is the case now. The difference is that at least some of the individual market in your state will have some structure to it, as well as consumer protections (which you've already enjoyed for years if you're in employer-sponsored group coverage).
There's no national program you gain access to if your employer doesn't offer insurance, you'll still need to go buy private insurance in your state.
Don't believe me, look at all the waivers that Pelosi and Obama have given to Union shops and restuarants that they like, it's all over the place, it you are a favored person, you get the waiver, it not, you get to pay.
Those are waivers from one page of the legislation, the one requiring a phase-out of annual limits on insurance policies between now and 2014. A small percentage of health insurance plans have annual limits on benefits and the law seeks to end that; however, some of those plans would be destabilized by that change and, if they could demonstrate that this is the case, they can avoid that change until 2014 (the GAO looked into the waiver process and found the process to be clean, with approvals and denials based on a numerical standard for the premium increase caused by the annual limit phaseout; by the way, most of the denied applications were union plans).
The actual impact of that annual limit phase is small because annual limits aren't particularly prevalent:
Only 8 percent of large employers, 14 percent of small employers and 19 percent of individual market policies impose an annual limit and thus would be directly impacted by these interim final regulations. [54] In the first year of implementation (beginning September 23, 2010), it is estimated that less than 0.08 percent (less than one tenth of one percent) of large employer plans, approximately 2.6 percent of small employer plans, and 2.3 percent of individual plans would have to raise their annual limit to $750,000. [55] This first-year increase in annual limits would potentially affect an estimated 1,670,000 persons across the three markets. The second year of the phase-in, beginning September 23, 2011, would affect additional plans and policies, requiring a cumulative 0.7 percent of large employer plans, 3.9 percent of small employer plans, and 5.3 percent of individual policies to increase their annual limit to $1,250,000. The second-year increase in annual limits would affect an estimated 3,278,250 persons across the three markets. The third and final year of the phase-in period (beginning on September 23, 2012) would affect additional plans and policies requiring a cumulative 2.4 percent of large employer plans, 8.1 percent of small employer plans and 14.3 percent of individual policies to increase their annual limit to $2 million. The third-year increase in annual limits would affect an estimated 8,104,500 persons across the three markets. Note that the estimated number of plans and people affected are upper-bound estimates since they do not take into account grandfathered health plans and plans that receive a waiver from the annual limits policy.