The thing about learning on a film camera is that you really have to learn about everything to pull it off without wasting a ton of time and money. You have to really understand before you press the trigger what it is you're about to capture, how, and why. It forces you to think about each shot, to be selective about what you're shooting and how and why. You have to understand what you're doing enough to pre-visualise the results.
You take notes about your shots, and have to wait to see the results, even if you develop them yourself. You're limited to how many shots you can take before you have to change out your film, and since each one has a dollar amount attached to it, you learn to be more selective and concentrated on each.
With digital, there's a tendency to use a shotgun approach. Just shoot at every aperture and shutter speed and with every lens you have at your disposal, then choose a keeper or two from maybe hundreds of shots, without really understanding or caring what made those particular keepers work. Instant review means shooting hundreds of photos one after another doesn't require much thought at all, especially since it won't cost a penny more to do so. You can throw out 10,000 photos without blinking an eye because it didn't cost a single extra dime.
I love what digital allows me to achieve. But still, there's something to be said for forcing photography students to learn with film, IMHO. It forces them to actually take the time and make the effort to truly understand it all at a gut level until it becomes instinctual, and the knowledge and understanding gained from the process is the very best foundation for an aspiring photographer to build upon.