They need money so I agree property development and sales is where the big money is.
Also, for every hour spent with a trolley or on d2d is an hour not making money in a secular job to be able to donate to the society. This attitude of working part-time in order to spend more time on the ministry and pioneer I believe will be "adjusted" although it will be a loving provision that full-time work will become a blessing.
I think there has to be a push for the donations from those still in to increase as any-one not JW would not give their hard-earned cash to a a cult.
A new book used to be a million dollar best seller as 7 million were needed upon release but with downloads which can be shared even that avenue of revenue will be gone soon.
There are not many options left for them and with increasing lawsuits for paedophilia and subsequent massive payouts I have a hope for their demise within a generation or perhaps no more than one overlapping one.