Well, there's two parts to your question, if there is a demand, why isn't there a supply, and is there really a demand? For the first part, if the original com

Well, there's two parts to your question, if there is a demand, why isn't there a supply, and is there really a demand? For the first part, if the original company has gone out of business, and enough records and knowledge lost and scattered, then it'd actually potentially be very difficult for a new group to identify what the original customers were, much less identify what the potential size of market is today. That's quite a lot of risk to take on (in my mind anyways). Industrial automation is one of those things that people don't openly disclose in a way that makes it easy to canvas the market cheaply.