Well, I agree that it might be odd to complain about SL dying. It's not a process a single person could evaluate properly as there are too many parameters having an impact on the number of active users.
What I experience on my own is that more and more sims I visit are deserted... I further experience that the traffic on the sims I frequently visit is decreasing. I further experience that sims without any business purpose are decreasing (sims only having beautiful gardens, landscape architecture, themes without any commercial purpose). This makes it for me less attractive to visit SL.