I am admittedly a huge fan, since the late 70s.
They were / are all having physical issues. Neil was already having tendonitis, arthritic, and joint issues from years of 3-hour sets regularly, not to mention the cardiovascular element.
Alex has been battling carpal tunnel and arthritis for years as well. And Geddy's voice has been in decline for some time, requiring at least one off day after a show.
They preferred to pack it in before things went south badly, embarrassing themselves, ruining their legacy and reputation, on their milestone 40th anniversary, more or less. Lots of other bands, including some of my personal favorites would do well to learn from that example.
Their was talk and speculation that they might still write and record, but not tour...perhaps doing a PPV event one-off, but don't see that happening.
Heartfelt sorrow for all his loved ones, and thankful his suffering is over.
Thanks to all three of those crazy Canucks for everything.