I feel like LoL is getting dead since some time..
90% of the time you will have a troll / afk in your team nowadays..
I would rather say these forums are dead? Also yeah, many people from here don't seem to be playing League anymore. I sometimes play, then take a break.
I wouldn't say the game is dying in general, though. About the trolls and afks... I remember getting the same amount of them in 2012 and now. Maybe more afk people now? Not sure..