Ill grant you 650PH in a year is at the extreme upper end of what I think is even conceivable. But only a very small % of all bitcoins mined by the device will happen after the 6 month mark, which at 9B isnt exactly far fetched, so the last 6 months or so of that simulation are irrelevant compared to the first 6 months; just as 650PH at the end of 1 year isnt very likely, its equally unlikely to me the next 10 difficulty adjustments will all be smaller than the past 10. The next 10 will coincide with KnC B2+, Hashfast, ActM, Bitmine, Cointerra,  Black arrow  perhaps even BFL Monarch, next gen avalons and next gen asicminers hitting the market,  the previous 10 were caused basically by just 2 vendors.

SO the simulation is very flawed  (why doesnt anyone implement a calculator with a sigmoid function for difficulty?), the conclusion might still be true for the simple reason that I cant think of a mechanism that would cause asic manufacturing and deployment to stop as long as each of these miners is operationally reasonably profitable for those with access to cheap electricity. The real question therefore becomes how fast these vendors can produce and deploy, and KnC shipping up to 600 boxes per day gives us a glimpse of how fast this could go, particularly with 10 competing suppliers (at least one of which is using monster sized manufacturing facilities)..