There has never been a “Thousand Year Reich”, Republic, Monarchy, or anything else. The Chinese probably come closest and if I understand correctly they were at constant war with each other and Mongols. It just can’t be done. The people required to do one step are changed by the result to people who cannot do what their fathers did. It’s like stirring the cream out of coffee. It’s a one directional transformation.
Marxists have waged their battle to tear down Western civilization for over a century and slowly they are ‘winning’ and the past and opponents are being buried or banned.