My SA just ordered the Graceful PM in DE for me since every time they get a handful of these bags in the store, they sell out the same day. That's just the nature of luxury shopping--I'm just very patient and I enjoy the LV items that I currently have while waiting for the call from my SA.
I was just in my LV store (and it is a small store), and they have large quantities of canvas bags and SLGs. The leather bags are prominently displayed at the front, but there is also copious amounts of canvas bags in glass cases in the middle of the store.
Anyway, there's no shortage of LV canvas bags and SLGs. There's none whatsoever.
These are just rumors that are blown out of proportion by conspiracy theorists/click-bait-ists and "insiders" just to put people in a panic.