The JWs have now been discouraging higher education and critical thinking for a long time. We have all seen the 'dumbing down' of the WT literature. On a personal level I have seen many of the perceivably intelligent younger members of congregations leave. Pursuing a decent career is frowned upon.
Studies have show the low economic status of JWs... it seems the jokes about "window washers" could be accurate (eg. http://users.adam.com.au/bstett/JwSocioeconomic86.htm)
It seems to me that such a large organisation needs many highly skilled and very intelligent people to survive. Perhaps it will be this ever increasing skill gap that leads to the downfall of the WTBS?
Increasingly when I meet the odd witness out and about they seem almost incapable of holding a sensible discussion, often do not know much about current doctrine, much less able to understand views counter to their own (especially from an atheist perspective). Without attempting to create a flame war... IMHO the older generation (in the traditional sense, not WT current light) just seem more intelligent and in my experience the younger JW's seem often to be a little slow? (Apologies for the wide sweeping generalisation).
I would say the knowledge of the average member in the 90's when I was a teenager was greater. Would people agree with that?
Surely there will come a point where the WTBS will need to use more and more 'worldy' organisations for support? Copy writers, solicitors, architects, logistics experts, etc... etc... do we have any evidence for this?