I can't speak for the 64 bit issue or this "NvdA dying" debate which seems to have been raging.
I can say though from the perspective of a comparatively new NvdA user who has been using it for two years now, one thing I do! like is the frequency of updates and the improvements I've seen in newer versions myself over time.
To me, "dying" implies the reason I stopped using supernova, namely that the program firstly stops working with a significant amount of things I want to do on a newer system, and that the company developing that program are no longer interested in improving it to allow it to do those things in the future.
of course, I freely admit I don't give a rat's rear end whether NVdA has 64 bit support or the latest hinky plinky tripple max super bit computery wootery whatever, I care about whether it does the things I want it to do and continues to do which at the current time it certainly does, hence why I am more than happy to donate.
other people's priorities may differ, which is fair enough.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)