The whole mining industry is plummeting, not just AM. 25% hashing rate increase/cycle means the mining co must pay 25% more to keep up with the trend. The profit margin goes to zero!!!
Nature abhors a vacuum so mining will quickly become a 0-sum or very low margin business. At least when it comes to mining. There appears to be a constant supply of fools to sell hardware to. So I'm not worried about low AM mining hashrates - Selling hardware is the name of the game now.