People are the problem!
Why do fresh & shiny new systems fail? People. People suck! They don’t do what you want them to. They don’t follow instructions or read manuals. They can’t follow simple processes because they say they are “too busy ” well, get over it. Seriously. Please get over it. It’s time to admit you have a problem and that problem is people.
So, what are you going to do about it? For starters, why not try to accept that people aren’t going to change. Maybe the problem is you! How would you change the system to accommodate the way people actually work?