Regarding the possibility of lower testing demand I see a couple of pieces that may play a part in this.
One is that the lag for testing in this country is scandalous. A week to 10 days to get some results? Almost worthless as a tool to help control the spread of COVID-19. If one devalues a product enough that consumers no longer want it that's not an indication of real demand or lack thereof. It's a sign that the implementation of the idea is crap and needs to be addressed with the zeal and attention one pays to an emergency.
Another issue that the powers that be continue downplay the vital role testing plays in controlling things, and those powers that be can come from really interesting corners. My wife works at a hospital and they are fairly strict on mask wearing. However, one of her patients later tested positive for COVID-19 shortly after being in an enclosed room with her for some period of time (15 minutes or so). The patient contacted her himself to tell her this. Ideally, one would think, the employer would immediately order a test for her to ensure she was not contagious and help prevent possible spread to her other patients. Right? Right? No. According to the hospital her encounter did not meet "exposure criteria" and ordered no test. She had to seek out a test on her own and thankfully the test came back negative.
In another case one of her coworker's live-in son contracted COVID-19. Did the mother get a test? Nope. She said she felt fine and exhibited no symptoms and the hospital was OK with this rationale. If scenarios like this are one of the reasons for falling testing demand then that needs to be resolved immediately.