At this point, everyone should be aware of supply chain issues everyone is having. I recently learned that a driver manufacturer I am dealing with has a six month back log on drivers. Order (and pay today) and they will deliver six months from now, fingers crossed.
I don't deal with Scanspeak which is who who Wilson sources most of their drivers from but I can't imagind they are imune to the problems that everyone else is having. And all of Wilson't drivers are customised so it is not like they can just see if Madisound has stock.
The dates manufacturers provide are based on the dates they are getting from their suppliers. If these slide, their dates slide. It is not a good time to be producing things.