We already have examples of this. What happens to people with Down syndrome? Where do chronically brain-damaged folks work? Where can senior citizens who have fallen prey to dementia get jobs?
One of the local Carl's Jr fast food restaurants has several employees with Down Syndrome. They bring trays to tables and mop the floor. I think it's great that the management gives them the opportunity to do some productive work.
Indeed. Note that there is a huge chunk of population in the gap between special programs for the severely brain-disabled and those who are just barely low-IQ enough to not finish high school. These people are being squeezed to death between the minimum wage and the export of manual labor to other countries.
And who is doing the political squeezing? A cognitive elite that are being efficiently skimmed off and segregated by IQ in late childhood. This bodes poorly for the stability of the nation.
Of course, this all depends on how much you trust the entire concept of nations... Maybe that era is starting it's final days, and the next force is going to be global companies that hire the elite across the old national boundaries and the the lower classes are stuck for a long time until the world catches up.