On Wednesday's show, Gil talked about Gene Burns. He explained that Gene's condition (caused by a stroke, I guess) has caused him to often use the wrong words when speaking. According to Gil, Gene is healthy, ambulatory, and feeling fine. His speech is not slurred, but apparently he picks the wrong words often.
This obviously makes it impossible for him to host a talk show, but Gil pointed out that it's very possible that Gene's condition may improve greatly, or even resolve itself. The human brain is amazing in that way.