Nobody said the average CRS cutline will drop in 2020, but we are 90% sure the lowest CRS cutline of a year appears on Dec or Jan.Why is it assumed that the score will reduce in 2020? I don't know. I'm genuinely asking.
It is an assumption based on past experience:
1. There are always 2 draws per month. If the 2nd draw of Dec sits between 12.24-12.31, IRCC will do it 1 week ahead. (B2B draw lowers the cutline)
2. The cutline is usually lower in Jan since the PNP of the new year is not kicked in yet.
The above assumptions was proven true every single past year:
https://www.canadavisa.com/express-entry-invitations-to-apply-issued.html#gs.fsskvv
But for 2020, nobody knows. Thus I said 90%.