Something I heard the other day is that while the marginal cost of those tests may be $10, the total cost could be say $50-100 per test depending on how much new equipment you need to buy upfront. A big thing too is how heavily they can be automated. If it's a lot of manual work, the labor costs add up and can become bottlenecks as you try to really scale up.
Multiple medical organizations have come out against the CDC's new guidance. Well, really, it was the White House Coronavirus taskforce absent Dr. Fauci that pushed this new guidance on the CDC rather than any scientific experts. The entire plan now is to insist that this is all in the past, we don't need testing, we don't need relief, we don't need PPE. Shut up and get back to work/school, we don't care how many of you suffer or die.
e: relevant UIUC testing volume:
This is one (albeit large) state university, and just them doing the minimum amount of testing to *possibly* safely reopen is accounting for a decent amount of our entire national testing. If just the flagship university of every state did the same amount of testing, we'd more than double our current national testing capacity.