“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?)”
I’m not sure what all the market segments are necessarily, but based on the rate of growth that has taken place for digital indoor and outdoor advertising, I could imagine that five years from now, it could indeed be completely saturated. If that happens, then the novelty of static signage might increase the appeal to advertisers … perhaps not in the form of traditional back-lits, but rather wall wraps or stretch vinyl installations.