The problem with scaling down a decent size E6 or C41 processing line means replacing it, for many thousands of dollars. It just isn't cost effective, especially when you can see demand falling in the future. When the 1 hour giant grocery chains switch to send out two week turnaround for C41, there is no consumer demand either. Yes you can do C41 by hand or in a small processor, but not many people are willing to pay something like $20 for develop only for C41 and quite a bit more for E6.