Several points about J:
J is the real-estate equivalent of the anti-politician (of which Pauline Hanson has been the most high-profile). Both politicians and the real estate industry have done enough to make the public receptive to various anti-messages. They have made their bed and now must lie in (or about) it.
J cannot be considered 'independent' or 'consumer advocate'. He is however aligning himself more closely with 'buyers advocates' eg Terry Ryder by promoting his books and company.
If the REA nearest me is any guide, J is losing support. When the agent dropped its national franchise name and 'went J', it had an endless loop Jenman tape playing through a speaker at the front of the office at night (for passersby to get the gospel). This only lasted for 6 months or a year. More recently the big 'Don't Sign Anything' illuminated sign was removed. And inside it's J'ness is much less obvious than it was. The publicity strategy chosen certainly gets headlines but is also highly nest-messing.
On the other side of town in a poorer outer suburb another agent remains J, though they can't be following pure J since they advertise and have signboards on houses. However, much like the Salvos align themselves with cleanliness, home economy and goodness amongst the poor*, J agents align themselves with wholesomeness and moral uprightness. For instance by encouraging visitors to offices to help themselves to free apples (stressing the health aspects).
Just as there are similarities between get rich spruikers and modern religious charismatic evangelist movements in style, I believe a similar parallel exists between J and fundamentalist religious evangelism, with similar puritan or moral undercurrents.
Just like the 'sophisticated' middle-class inner-suburbanites frequently laugh off the Fred Niles or the Hillsongs with their simplistic moralistic cliches, I detect a parallel disdain of J's fire-and-brimstone absolutism amongst some who'd consider themselves smart investors. This comes through in some of the posts you see here.
But for a general audience J fills a niche that will remain as long as the present reputation of agents and their institutes remains (sometimes deserved in the case of the latter).
For investors (who will work with whatever sales system is in place to obtain Property X for $Y to generate $Z return), we're perhaps less scared of agents than average buyers are (who might only deal with a few in their life) so some of J's comments are less pertinent.
Peter
(*) For instance Salvos op-shops in poor areas, along with the usual used clothes often sell discount soap and cleaning products. Sometimes cheap new cooking appliances are also sold (presumably to reduce junkfood consumption).