We don't - but society didn't feel obligated to carry the ferriers when the car eclipsed the horse and we (again, abstract society) have generally been pretty okay with not specifically planning for those disenfranchised populations. This is brutal and it's capitalism - if you're a staunch libretarian you probably don't mind that those who didn't adapt are outed as losers but... these sorts of technological revolutions have a lot of spare efficiency that's brought along with them. That spare efficiency can be taxed and used to help fund education and small business loans to try and preserve prosperity.

When it comes to the international scene I think it's pretty clear that the "haves" coming will have strong reasons to make sure that the "have-nots" aren't devolving into anarchy since that causes global problems. Whether they act intelligently isn't something I can comment on - but there are clear benefits to everyone involved.