It's tempting to think that, but the dividend profits remain the same, additionally the expenses for Asicminer reduces since they don't need to convert as many to cover costs, thus there would likely be a marginal increase in dividends, thus justifying the price of the shares remaining the same (or perhaps even higher since AM is suddenly spitting out higher divs). Asicminer's competitiveness to reap massive profits haven't changed, and even though there are competitors on the horizon, they are still left to prove themselves. BTC holders really shouldn't be losing value on the shares in BTC, only those that aren't in the Bitcoin economy should be at a disadvantage.