Why bother taking them off the market for any time at all? It's not like the buyers expected the price to stay high forever - every single one of them paid a high premium for immediate delivery while difficulty was (relatively) low compared to other device offerings. All buyers of dedicated single-purpose mining hardware know the hardware is a depreciating asset, it should come as absolutely no surprise to them when the price drops. If people get upset about it, it's their own damned fault for having unrealistic expectations.
I agree that people should not be upset about the price dropping, but at the same time customers may be hesitant to buy if prices are always dropping (may reduce long term revenues). I am a fan of keeping the price stable if there is still strong demand as friedcat stated.
Currently AM still has 0 competition in terms of companies that can reliably ship you an ASIC in a reasonable time frame. Until BFL and other companies actually do catch up and start shipping in a timely fashion, I don't think AM should react to their pricing.