Though while reading posts here, I also think, to some degree, "now is not the time" in the context of his health means there will never be a time,
Well, there has been plenty of time before. I myself have been critical of his viewpoints in the past. But to do it now, frankly, seems mean, heartless and vindictive.
When you learn someone you disagree with is dying, I think the best think you could do is to use that occassion to remember we're all human, we really have more in common than what differentiates us (we just obsessively focus on the latter), and something like cancer can put some other things in perspective. It feels like an easy, golden opportunity to exercise some emphathy, tolerance and forgiveness, because if not now, then when?
I just read this today and made me think quite a bit; it seems particularly relevant for this conversation:
http://slatestarcodex.com/2014/09/30/i-can-tolerate-anything-except-the-outgroup/
When was the last time you exercised actual tolerance towards anyone in your outgroup (as defined there)?