I wouldn't say underestimate, I'd say mis-estimate. Sometimes things sneak up amazingly quickly when no one is expecting them, or actively dismissing them. So

I wouldn't say underestimate, I'd say mis-estimate. Sometimes things sneak up amazingly quickly when no one is expecting them, or actively dismissing them. Sometimes things that we expect to happen don't, or take a lot longer to happen that anyone thought, or just turn out not to be worthwhile by the time they do happen. Maybe drones will be delivering packages in a year, maybe they will end up like flying cars; something with huge potential that exists only as a novelty in the present.