I see your point, Rob. But whilst natural attrition of those well known celebrities now in their 60's and 70's, is to be expected, it would be more normal to anticipate these over a longer term, and to crop up from time to time. What marks 2016 out from the rest, is the sheer volume of deaths concentrated into a very short period, timewise.
Of course, 2016, like any other year, is essentially an artificial construct. So logically, you wouldn't necessarily see a sudden decline in deaths the moment 2017 starts.