According to WIKI, it was because it didn't compete with other shows:
In 1991, Reagan was the host of The Ron Reagan Show, a syndicated late-night talk show addressing political issues of the day. However, it was cancelled after a brief run, unable to compete with the higher ratings of The Arsenio Hall Show, The Tonight Show Starring Johnny Carson, and Nightline.
Reagan has worked in recent years as a magazine journalist, and has hosted talk shows on cable TV networks such as the Animal Planet network. In Britain, he is best known for having co-presented Record Breakers (based on The Guinness Book of Records) for the BBC. Reagan presented a report from the USA each week.
He currently serves on the board of the Creative Coalition, an organization founded in 1989 by a group that included Susan Sarandon and the late Christopher Reeve, to politically mobilize entertainers and artists, generally for First Amendment rights, and causes such as arts advocacy and public education. From February to December 2005 Reagan co-hosted the talk show Connected: Coast to Coast with Ron Reagan and Monica Crowley on MSNBC.
During the 2007 holiday season, Reagan hosted the Neiman Marcus/Children's Hospital of Dallas' Christmas Parade.
In an April 2003 interview, Reagan said, "The Bush people have no right to speak for my father, particularly because of the position he's in now. Yes, some of the current policies are an extension of the '80s. But the overall thrust of this administration is not my father's – these people are overly reaching, overly aggressive, overly secretive, and just plain corrupt. I don't trust these people."
He also strongly opposed the Bush administration's decision to invade Iraq. "9/11 gave the Bush people carte blanche to carry out their extreme agenda – and they didn't hesitate for a moment to use it," Reagan said. "By 9/12 Rumsfeld was saying, 'Let's hit Iraq.' They've used the war on terror to justify everything from tax cuts to Alaska oil drilling."
In July 2004, Reagan spoke at the Democratic National Convention about his support for lifting Bush's restrictions on federally funded embryonic stem cell research, a form of research which some scientists believe could lead to a cure or new treatments for Alzheimer's disease, of which his father had recently died. "There are those who would stand in the way of this remarkable future, who would deny the federal funding so crucial to basic research. A few of these folks, needless to say, are just grinding a political axe and they should be ashamed of themselves," Ron Reagan said of the restrictions. "We can choose between the future and the past, between reason and ignorance, between true compassion and mere ideology."
In September 2004 he told the Sunday Herald newspaper that the Bush administration had "cheated to get into the White House. It's not something Americans ever want to think about their government. My sense of these people is that they don't have any respect for the public at large. They have a revolutionary mindset. I think they feel that anything they can do to prevail - lie, cheat, whatever - is justified by their revolutionary aims" and that he feared Bush was hijacking his father's reputation.
Reagan later wrote an essay titled "The Case Against George W. Bush by Ron Reagan" for Esquire. He was quoted as saying that he voted for Democratic candidate John Kerry in the 2004 presidential election.