Actually, the 1,000 years is indicated in the Gospels, like in Matthew 24, where a season is the same as a 1,000 year period. Where a generation was mentioned and had the context of a complete age which was equivalent to a Dan 7:12 time frame of a "season and a little while," but because the scholars in the past could not get their heads around the length of an age being just over 1,000 years in duration, the meaning that was adopted was a period of time that was associated with a "descendant generation," namely a period of 70 - 80 - 90 - 100 years depending on our reference for the length in years of a particular descendent generation.
Because the context of the passage has been changed, our understanding is focusing on the misunderstanding that has been introduced and as such we are lost in our delusions.
Shalom