I think this advice may work for some, but for most I think advantages of digital far outweigh film, even for people just getting into the hobby. Chiefly, being able to make thousands of mistakes is not a bug, but a feature - you need to make mistakes in order to improve, and being able to make them quickly is a huge help. Secondly, digital cameras are so good now that you can just do so many more things than you can with film, like video, swapping quickly between light levels, extremely accurate autofocus, timelapses, astrophotography, etc.

A very restrictive medium can help spark creativity, but it may also prevent neophytes from finding it.