On top of that being an irresponsibly reductionist approach to the downfall of an enormous pre-industrial empire that not only had to defend vast borders but also deal with the economic crippling of having its olive groves in North Africa torched (which take 5 years to bear fruit and were among the biggest sources of Roman revenue), your comment seems to ignore the nature of technology in society today. Advances like self-driving cars could ultimately put entire human industries like trucking and the many towns that support them out of business, even if it makes things much cheaper. Ditto for, say, 3D printing. Would all those unemployed truck drivers and factory workers (not to mention their hairdressers, store clerks, prostitutes, etc.) cause no disruption to society?  It is sometimes cheaper to placate people than to let them suffer.