Still does CBS really need a Charmed reboot? Murder, She Wrote? Knight Rider and Bionic Woman made some sense, but others just ended and others still don't really have a fan base. What fanbase do you think Murder, She Wrote has? They are all dead.
According to Donald Bain in the 2010 book, Tied In
, 35 Murder, She Wrote novels were still in print and had a total print run of 4.5 million copies! Factoring in the notion that tie-in novels only sell to a slim margin on the source material's core audience and one can see that Murder, She Wrote still has a very sizable fanbase. In his essay, Bain goes on to say that he regularly participates in lectures on what is primarily a Murder, She Wrote fan cruise on the QE2.
Clearly with a fan cruise(!), 35 novels still in print, and 2 more contracted to be coming from Bain (at that time); Murder, She Wrote is still an ongoing business concern with a dedicated fanbase.