I have a feeling that the Amiga market can soak up an unlimited amount of accelerators. There are no leftover stocks. All previous A1200 ACAs have been sold. No more ACA 620 since... recently I guess. I checked AmigaKit's page yesterday and they are no more. There are only 1221s available (and they are the latest models) and limited edition 1233s (on Individual homepage).
With new mobos there will be more hungry mouths (expansion ports) to feed
So there is no rivalry between accelerators. We will buy everything