That's certainly correct, but that's not the only thing happening.
God help us and against the will of most people, the poorly-reasoned (and even more poorly-timed) plan of ACA is the law of the land. John Roberts put it on the 2012 ballot, and the Republicans were dumb enough to pick the only candidate that couldn't run against it. Fine. Bad laws happen, and the private sector will work around it. It sucks, but it's survivable (ironically, it's hurting the working poor with existing insurance policies the most. Classic).
It might only be the intention of House Republicans to use the shutdown in an ill-fated attempt to block ACA, but whether by accident or design, it's not a bad idea ($17T up the creek) to field test which nonessential functions the people footing the bill can live without. Given that both parties have no intention of ever cutting spending and this Administration has never advanced a plan to seriously address the debt, it does create a potential opportunity---if they were smart enough to take it----for the Republicans to show how much money that our government wasn't allowed to waste during the Shutdown, and return that to them in the form of a rebate, rate reduction, refundable credit, and/or national debt retirement. So...if you operate a daycare out of your home in the Mississippi Delta, and suddenly $250.00 shows up one day as your share of the savings for not having the gift shop open in Bangladesh consulate that you weren't going to, people might get a sense of the fact that yes, you can actually run a government without deficit spending. Since the people are the ultimate stakeholders in an efficient government, it might not be bad to help bring them closer to their stake in a well-managed central government.