If the Z9 sells as well as the D4/D4s the stock at launch would need to be a couple of months’ production, or around 3,000 to 4,000 units, based on sales of around 100,000 in the four years of production. Canon and/or Sony numbers for top end bodies are probably similar. If Grays and Park Cameras pre-orders are representative, a UK total of 1,000 might not be unreasonable. This would suggest that total sales, given continuing internet at a similar level, could exceed that of the D3 and D4 models combined. Both Canon and Sony have recently launched flagship models, meaning they will be working on the replacement, reckon on a two year gestation period. Nikon may actually be ahead because of the time from announcement to release being longer than normal. (I am assuming that work on a Z9 II will have started as soon as the Z9 design was frozen). We will have to wait and see if Nikon can manufacture Z9s fast enough to meet demand, or whether demand falls off.