The distributors seem to have been a lot more conservative in recent years, people I know who bought new (current year) bikes recently had to wait anything from a few weeks to a few months because it would be on the next shipment, not pulled from stock. No-one wants to be sitting on a pile of bikes to discount at the end of the season.
+1
Seems like in the good old days (2004-2008 ish) when the economy was booming and mountain biking growing exponentially (both in popularity and suspension travel) distributors would fill warehouses with stock for the summer and then be in a race to sell it off in the autumn before it became last years stock and even harder to shift as bikes really were getting substantially better with each model (with a few exceptions mainstream 2018 bikes still share their geometry with the better bikes of 10 years ago).
Nowadays with Canyon, Bird, etc you’re probably going to get as much of a bargain any time of the year, and there isn’t any real reason for a dealer to discount a 2018 spesh when in reality the 2019 will be at most a colour change and 5mm here and there.