In the end, professional photography is for the clients. Circumstances, market conditions, and how products and services have been advertised over the years will have a big impact on customer expectations.
I don't think 99% of clients give a rip how the light was captured (film or digital), but they will have a lot to say about how the pictures are delivered.
If film was to become commercially viable and competitive again, a sea change in consumer mentality and expectation needs to occur, and it probably won't.
With that, also consider that today digital cameras have some capabilities that film doesn't even begin to approach, particularly with regard to quality low light situations. Just today I saw a new Canon concept camera with a maximum ISO of 4,560,000, capable of full resolution video in what would seem like complete darkness, with better 'seeing' than the human eye under those conditions. It's pretty remarkable, and one has to appreciate how far that technology has come. I guess why I'm saying that is that we are getting farther and farther from film being a technical alternative, where the distance in sheer technical performance is ever increasing, and that too is a huge barrier to making film commercially viable again.