I agree that Mizuno may be well placed to pick up the disgruntled Adams low-mid handicap players.
My Adams A4 have been in the bag for 2 years and are not going anywhere soon, but I always thought I would replace them with Adams as I have liked the look of their updates - A12, CB2 & 3 etc.
When I do need them, my next set of irons may well be Mizuno, but if I needed a set tomorrow (and Adams were out of the picture) I would look at the i20's from Ping or the J40 pocket cavities from Bridgestone.