I think that the problem of attention deficit is getting worse and worse as the amount of information we are bombarded with constantly increases.
To be honest I'm not sure software can really solve this. The human adaptation to this is to form small communities (you mentioned 150) where the attention span of the individual can concentrate and each amount of information takes value.
I'm not sure the wisdom of the masses work when it comes to morality. I feel like everyday brings more political correctness to the point where divergent views are muted or judged amoral.
True debate is hard when the number of participants involved is huge because there is always a trend to alignment towards a general moral consensus.
Thanks for a great study into the subject.