I did a death list similar to your own from 1978 until 2003, when I moved to China and out of the zone.
My list also consisted of 50 people, but I wasn't allowed ANYBODY from the previous year, which makes it much more of a challenge - I couldn't just keep putting a swathe of the same wrinklies year in year out. It was excruciating when terminally ill people like Mitterand, Ian Dury, Helen Wills-Moody staggered into another year after being on for the previous one, and Lord Porritt booked out "a few minutes into the New Year"
I also had to recreate the age balance of the previous year's celebrity deaths, which invariably meant at least four or five under 50s.
I think a change in your rules to forbid annual repititions, and maybe encourage more predictions of premature demise, would make it more interesting.
Incidentally, my best performance was 10, which I achieved in 1989, 1995 and 1997.