It would be hard to capture the same zany style without Reinhold Weege. And as much as the original show made it clear that Dan Fielding's womanizing was a despicable quality, it was still played for laughs more than would be acceptable today, so I'm not sure how they could approach Dan in a way that would work now.
It wasn't just his show. As goofy as Harry Stone was, he was still the relative straight man anchoring an ensemble of colorful weirdos. In many ways, Dan was more the standout character, along with Bull. You could probably find a number of good performers who could fill the anchor role and bring their own personality to it the way Anderson did.
Not to mention that a lot of the show's humor came from the wacky plaintiffs and defendants they dealt with, and the way the leads reacted to them. Though modern TV is more core cast-driven and less guest star-driven.