I watched this for the first time the other day and was shocked they didn't make more (particularly as I'd noticed some other The Nice Guys titles in imdb but they're all shorts or what would have been DVD extras once upon a time). Given that this was initially developed as a series, I'm sure they have more stories to tell, It's a real shame.
I hate seeing new IPs not get traction as it just leads execs to churn out more of the same old remakes and repeats.