Many trade shows are industry driven. When an industry is popular, there tend to be quite a few shows to attend. Once an industry no longer has much competition, there is no need for trade shows. This happens on a regular basis. It is fortunate that new businesses keep springing up to replace outdated ones. The paper industry is one example. While there are still paper manufacturers and trade shows, many people use very little paper these days. It is a niche market. Fortunately, there are many software shows for the computers people use every day to replace the paper manufacturers shows.