I would care to differ, since it did receive a whole lotta time at NYCC for the older fans to get back in. G2 also started 2015 off with a new mobile game, which they hoped would assist in spreading BIONICLE to the younger audience. This is also without mentioning the web animations, which again were made with a younger demographic in mind.
Was it pushed as hard as Nexo Knights, with its TV show from the start, app, and web animations? No, not really, but seeing how Ninjago has been one of LEGO's better selling themes over the past few years and Hero Factory having a general decrease in interest, it's not hard to see why this happened.