Aviation as well as being very safety conscious, is also very resistant to change.
Your training system would have to either be 'obviously' better than what we have currently or be demonstrably better as proved by experimentation and testing, for it to be taken up is sufficient quantity to provide a viable business.
My own feeling as a PPL (I'm not an instructor), is that the training we receive in EFATO acts as emotional crutch as much as anything else. We know that an EFATO is the most significant danger we face, but we take comfort in the fact that we have been trained to deal with it, and that it forms part of any BFR or instructional flight for re-validation. I think we all worry about how we would react to the real thing, due to the infrequent nature of the occurrence, and the unexpected nature of the failure. But the training is the only defence we have. I think very few private Pilot's are prone to practising EFATOs, due to the low level that the exercise has to be carried out at and noise considerations.
My conclusion is that very few private pilots would buy into a different system of training, as they will cling to the belief that the training they have had and what little practise they get, will be sufficient. Unfortunately, I think that most flying schools will tend to follow the same path: i.e. that the current method of training is basically adequate, so why change (spend money).
I think most likely way to commerical success will be to to get the regulatory authorities to mandate the use of your system. Difficult as it may be, I think it is the only way you will get people that are not inclined to change to do so.