This problem is slowly being addressed for, at least, some devices. I have two machines that had the Conexant Driver problem. One is an HP EliteBook that is only 9 months old, and the other an HP Spectre x360 that is almost 5 years old. In both cases, I replaced the Conexant driver with the generic Microsoft driver and was able to proceed to 2004. On both machines I used device id blocks to keep the Microsoft driver in place after the update. Both machines have since been offered 20H2, but I have not gone forward to 20H2 yet. The point I want to make is that both machines have since been offered new (late 2020) Conexant drivers. I have installed the new drivers and both machines continue to be offered 20H2.
An important thing to note is that, if you are using device id blocks to keep the Microsoft driver in place, it may not be obvious that an updated Conexant driver is available. On both machines, I was aware that newer Conexant drivers were available only because I was doing manual windows updates and watching the offerings closely. As I expected, the updates failed, presumably because of the device id blocks that are used to keep the Microsoft drivers in place. Somewhat to my surprise, however, the failure was not recorded in the update history.
I was also surprised that when I removed the device id block, the new Conexant driver was not automatically downloaded on the next Windows Update. Perhaps it would have been eventually, but I didn’t wait. I used “Update Driver” > “Search Automatically for drivers” in Device Manager to install the new drivers.
Of course, I have no idea how many devices will ultimately be offered updated Conexant drivers. I think most of us suspect that the number of affected devices is large. Hopefully the issue will get some press as we approach the end of support for 1909.