Surprisingly few relevant past threads (that were any good), but I found these:
Gene Amdahl has died - https://news.ycombinator.com/item?id=10557793 - Nov 2015 (111 comments)
Compilers and More: Is Amdahl's Law Still Relevant? - https://news.ycombinator.com/item?id=8930987 - Jan 2015 (17 comments)
Amdahl's law in reverse: the wimpy core advantage - https://news.ycombinator.com/item?id=5265242 - Feb 2013 (16 comments)
Amdahl’s law - Amdahl's original paper - https://news.ycombinator.com/item?id=3490492 - Jan 2012 (1 comment)