IMO: Limbaugh _should_ be concerned for his reputation with the public and his viability in the marketplace; he's doing more to hurt both by his actions, conduct, and words than the court is.
I'm sure he believes there's nothing legally incriminating in them. But, all the same, there could well be other information that none of us, in his place, would want broadcast near and far -- information that may have no bearing at all on the drug matter. Given the DA's behavior to date, I can readily understand Limbaugh's reluctance to let that man access his information even under a gag order. Even still, the subject of a gag has not even been introduced. At issue is whether the DA has a legal claim on the information at all.
Concerning his reputation with his listeners, they seem to be standing by him in the main. If he's lost his audience, that's news to me.