From the low baptism counts going round since the end of 2014 continuing until now they have already stagnated. I believe they will manipulate the figures to show the tiniest of growths rather than a deficit - and maybe watch out for the "love of the greater number cooling off" becoming a theme!
The "Memorial count" is interesting - not really changed in the last 5 years.
Who goes to a memorial? New ones yes but also it is the last meeting attended by the faders, the "in only for family" types and the "disfellowshipped but mentally in" types.