Traditionally (as a former elder and account servant) the elderly, pre '75 age group were big contributors to the WBT$. This is fast drying up and it is going to be increasingly harder for the org to sustain itself for a large number of reasons, some of which are below:
1) Non-Dub family support will come with the caveat of reduced or eliminated meeting attendance. I have already heard of this happening locally and I witnessed it prior to my departure in 2010. The elederly will attend less and less and rely soley on shephearding calls that will not take place.
2) Children of both the elderly and emerging boomers will assume greater control via power of attorney for finances. Choosing between donation and costs incurred in their homes for taking care of elderly parents will be easy to make. If the non dub children outnumer the dub children that will pose a bigger problem. I believe that a number of dub children are already making wise choices in that charity begins at home.
3) the ratio of incoming vs outgoing is decreasing. Incoming are not as free with their money as the past generations were. They observed the events of 2008 and the fact that reliance on pension plans is a mistake. With the rich elderly gone there will not be enough support from other quarters - expect the org to ramp up about donations, planned giving, etc to be a bulwark against family attrition of assets.
Just some thoughts at lunchtime...