The book behind the paper includes lots more detail. Its introduction is quite cheery:

The end of dramatic exponential growth in single-processor performance marks the end of the dominance of the single microprocessor in computing... There is no guarantee that we can make parallel computing as common and easy to use as yesterday’s sequential single-processor computer systems, but unless we aggressively pursue efforts suggested by the recommendations below, it will be “game over” for growth in computing performance. If parallel programming and related software efforts fail to become widespread, the development of exciting new applications that drive the computer industry will stall; if such innovation stalls, many other parts of the economy will follow suit.