Educate them with what money? That requires redistribution of wealth because these people will not leave the workforce with the means to retrain and reeducate themselves.

How many scientist and engineers can any future workforce support? There will be a limit to how many "production" jobs there can be. By this I mean manufacturing, farming, infrastructure etc. This still leaves many creative endevours that can be produced and consumed almost without limit - but this also assumes people have expendable income.