To me, one of the many strengths of Doyle's canon is how many cases don't
revolve around plain ol' murder; robbery, blackmail, international intrigue and con jobs are just as likely to be brought to 221B. Also, sometimes Holmes and Watson side with the criminal, and on occasion there's no criminal, or even crime, at all.
A glance at the current episode list
, however, suggests yet another "all homicide, all the time" series, much like the similarly Holmes-inspired L&O: CI
I don't know what Rob Doherty and his team have in mind, but I can see some in-character reasons for why Holmes would focus on working with the police on murder investigations for the time being. He's in a new city, he just got out of rehab, he's trying to find his feet. Hanging out a shingle as a consulting detective and waiting for people to bring cases to him isn't going to help his ennui. (If you remember in the Canon, when business was light like that, Holmes turned to the cocaine.) Focusing on murder can keep him focused.
I would like to see Holmes do some private consultations that have absolutely nothing to do with the police. If that happens, though, I wouldn't expect it for a while down the line.