The society make changes to doctrine and practice for 3 reasons only:
1) The fact Armageddon still isn't here. All the major doctrinal changes in the past 20+ years are down to this.
2) Legal implications. The possibility of being liable and having to pay out large settlements and/or facing criminal proceedings.
3) Money. This would include loss through changes in tax law, a downturn in the economy (such as now), loss of membership and therefore loss of contributions and legal settlements (see #2). I think there is no doubt the WBTS is running low on funds. The sale of it's property in Brooklyn, reducing the frequency of publication of magazines, transferring to softback and not using full colour on the members only WT to name a few.
I have thought of another major contributing factor in their reduced revenue. If there are thousands of people like me trapped in the organization but no longer believing what is the only action they can take without visibly withdrawing support? Stop contributing. I think the fact that they are suffering financially is a testament to the possibility that there are potentially hundreds of thousands of lurkers on this site and others like it. Mentally and financially they have checked out the borg.