Generally speaking, a standalone talk show host does not always do well by themselves at any station;
Let's see. Stern. Limbaugh. Hannity. Dr. Laura. Clark Howard. Boortz. The biggest names, past and present, in talk are solo acts.
On a local level, from Ronn Owens in San Francisco to Neil Rogers in Miami, it's mostly solo acts that work consistently.
BTW, Why is KFI such a revolving door? The mainstays (Handel and John & Ken) are always there, but every other time slot seems to change like the wind.
Handel, Rush, Laura, John&Ken, ACC, and many weekenders have been there for an eternity in radio years... The Laura departure seems to be one the stations wanted, and only nights have been less stable, but still we are talking aobut maybe three different shows in 10 years.