  I summarize the science drivers presented at the workshop for Phase I of the
Square Kilometre Array: 'Advancing Astrophysics with the Square Kilometre
Array'. I build from the historical perspective of the original Key Science
programs: 'Science with a Square Kilometre Array', and consider progress in
astrophysics since 2004. I then present my 'score card' of the primary science
drivers proposed by the Science Working Groups, and further developed in the
white papers and presentations at the meeting, assuming a conservative high
frequency of 3GHz. The science case for the SKA phase I is compelling, with the
right mix of killer applications (eg. pulsars and gravity, 21cm cosmology),
foundational radio astronomy (eg. cosmic magnetism, baryon cycle, high energy
phenomena), and high risk-high return 'game-changing' programs (eg. fast radio
bursts, BAO intensity mapping, SETI). A strong case was made at the conference
for band 5 (4 to 15GHz), in particular in the area of planet formation and
exobiology. Such a capability engages the rapidly growing exoplanet community,
and enables fundamental breakthroughs in most of the key science areas. The
case for real-time data spigots that allow for commensal observing is also
strong. Ultimately, the greatest discoveries that will come from the SKA are
likely even richer still, and beyond prognostication.
