Journeyman, take 2

I can sense it already - I'm about to get sucked into a show that I know will get canceled very, very soon. This happens to me with some degree of regularity, the most recent examples being Daybreak and Journeyman. The thing is, I know these shows are not long for this earth when I start watching them, yet I'm swept in nonetheless. This season's contestant is Life on Mars, a show about a New York cops who finds himself - via some means or other - "stuck" in 1973. He exists there -he has a job, he owns a car, etc. - so it's not a case of traveling through time. Intriguing premise, solid premiere, but I wonder how sustainable the concept it. After all, will this have an ongoing mystery, or will it morph into a standard cop show., albeit with an unusual fish-out-of-water element? Alas, we may never know...