There really just isn't anything new to discuss while there are tons of other exciting crypto projects.
Larimers claim things will be picked back up, but meh. Until then what is there to talk about? Innovation drives interest and it is going on everywhere else unfortunately.
Peerplays sounds cool, but it did nothing with the social consensus. Basically it appears the social consensus is completely dead. It was a good marketing angle I guess. There just aren't many things that are discussion worthy. It should be absolutely no surprise the activity has dropped dow.
When and if Bitshares 3.0 is made, then I'm sure things will pick back up. A bond market + margin trading would be awesome.