“Which market segment is the one that is totally saturated with digital signage five years from now? (Is there a market where the gold rush is over and every new opportunity has been already taken?)”
The retail market is currently full of digital signage opportunities that provide stimulating customer experiences. I expect to see digital signage in all markets grow as the technology transforms. As for the gold rush being considered over, I don’t see this for any market. Opportunities for innovative uses will continue to grow as the technology advances.