Better than the 'Public Option'?

Instead of making our insanely complex health care system even more complicated by adding a 'Public Option,' why not just let everyone buy into Medicare or the private health care plans for federal workers at cost?

This would give us everything the 'Public Option' is supposed to do with less cost, less complexity, and without creating a new government program. Admission would probably need to be phased in so these systems don't have to absorb 30 million people in a single year (30,000,000 / 365 = 82 thousand people a day. That's a lot). Those buying in get the cost advantage of the federal government's bargaining power, and since the buy in is at cost there is no increase in federal debt.

It's simple. It's straightforward. It should work pretty well. Let's do it.