Nah, they weren't trying to shut down Obamacare, they aren't that dumb. It was a 24B publicity stunt for their supporters. You can't shutdown law upheld by the supreme court and voted for by popular election twice, simply by defaulting on government debt. Law of the land and budget are two entirely separate issues. There is no connection.

Obamacare is already paid for, it is part of the budget. Repealing it now, ignoring that this is impossible, would save 0 dollars.

http://www.cms.gov/apps/docs/aca-update-implementing-medicare-costs-savings.pdf

Obamacare will save this country billions upon billions over the next decade. Privatized healthcare was 16% of our entire GDP. The regulations this act puts in place and the revenue it raises through more people paying into a more affordable and more efficient system will significantly reduce the percent of GDP we spend on healthcare while at the same time improving care.

We know this because all economic studies not put out by right wing groups show this to be the case again and again, and even in the short time some parts of it have been implemented, for the first time in the history of this country the overall cost of healthcare has been dropping. This has never happened, it's always gone up even immediately after the biggest recession since the Great Depression, healthcare monopolies and pharmaceuticals still continued to raise prices.

It's hard to argue that this is a coincidence.

But even if you want to ignore all non-partisan studies and the first actual decrease in healthcare costs in history,

Just look at the cost of healthcare for the U.S. compared to every country in the world, and then compare the level of care.

We have been paying almost double for the 24th ranked healthcare in the world for decades.

While countries with similar plans to Obamacare pay a fraction of the cost and get better healthcare.