I had the same experience with my local AD, placed my name on the list for Batman (or Batgirl) in June, was told waitlist is around year and a half, but that's not guarantee (I have small relationship with them, got Sea Dweller last year, serviced some jewelry and refurbished 24 year old Breitling Aerospace - they sent it to Breitling Vintage)
I got it before two weeks at the begining of December (so 5/6 months waiting), the sales person said for some reference 5 people gave up - so it's either that people are giving up because of uncertainty, or lower general income because of Covid
From other source I heard that people from the seaside in my country (which have higher income because of summer season and tourism) gave up on purchase this year - there was less extra income this year which they would normally spend spending on luxury or something else