They have "traditional" values in common despite Trump's presentation. The difference is Trump/populists, Palecons vs the Neocon globalist establishment. The Neocons politically and in the news media have failed miserably in 2008, 2012 and routed embarrassingly by Trump in 2016. Hillary shares some common ground with these Neocons and lost. Following that as a business plan on radio would seem destined for failure. Hannity, Rush and Levin for years played to the tune of the Neocon establishment but they saw which way the wind was blowing and adjusted somewhat accordingly.
So I question why would a station put on a talk show host given that history if they actually want to increase ratings. You see the overwhelming opposition to Trump across the left wing media and partly on the right. So it would be of no surprise considering all this that the selection of Shapiro is partly politically motivated to herd voters accordingly back into the fold for elections in years to come.
Trump has never had a plurality of support among conservatives. Trump took advantage of a crowded primary field to win the nomination, then of course Republicans voted for the Republican and Trump won, without winning the popular vote. Trump's "base" is probably about half of conservatives and shrinking daily. If this is about politics it's because even conservative talk radio listeners are suffering from "Trump fatigue."
Also, do not discount the portion of talk radio listeners who just scream back at the host the whole time.