what everyone seems to forget is that for the diff to double from here it requires 4000 1T machines. Its not going to happen as fast as most people thinks
Really? One company--Cointerra--claims that they're going to deliver 2,000 terahashes of hashing capacity in December alone.
Or think about it this way. If the difficulty increases 25% for each of the next three intervals--which of course it will, it's not like the ASIC vendors are closing up shop--then the difficulty will double. And an interval is like 10 days now, so we're talking a month.