I am doing maintenance for some software in roofing industry. The software was written 25 years ago and it sux in so many ways. My first reaction was that it wo

I am doing maintenance for some software in roofing industry. The software was written 25 years ago and it sux in so many ways. My first reaction was that it would be very very easy to make much better version of this software and take the market (other solutions sux in same way). After working on it for past 9 years I can say that the software might looks very simple on the outside, but then you find a lots of proprietary data that are really hard to get (say the information how many man-hours will take laying down the some kind of roof using some type of technology process) and some partnership that will make it quite hard do as an outsider. I am not saying the disruption is impossible, but it could be very hard and just a better software itself will not help.