One of the issues is the fairly short timescale over which this is happening. The other is that no credible alternative has emerged as to what role displaced workers, and ultimately their descendants, will have in a society that will be unable to offer employment opportunities. This situation can be distinguished from the reduction in the farm population where farm workers were readily redeployed to the industrial/factory sectors.
There are a lot important questions that will need to be answered in a very short time. Where will the future unemployed be redeployed? Will the lack of employment lead to instability and civil strife? What about social mobility and advancement? Will the inequality gap worsen?