Look, I understand that the potential for the Senate to remain in Republican hands is a legitimate angle for coverage of Senator Johnson's health troubles, but there have been plenty of senators who had serious illnesses without being talked about as if their death was imminent. Biden was out of the Senate for quite some time. Specter has had multiple major illnesses.
CNN's correspondents seem to mostly be approaching this reasonably, but the anchors who are framing the issue are totally focused on the possibility that the Dems won't be able to take control.
...adding, there's an additional reason people try to keep their jobs even when they're sick - employer-based health insurance. The idea that they're going to throw a sick guy out of the Senate because he's gonna miss some work days is absurd.