If SL ISN'T dying, please explain to me why...
1) Sony cancelled SL Go but still support OpenSim
2) Log-ins and active sims are drastically down, even on 2014's totals
3) MCs and vehicle users are defecting to GTA V in droves
4) SL videos on YouTube are outnumbered by GTA/GMOD vids by about 15:1 (and check out the ratio of likes)
I don't think SL decline is anything to do with mesh or mainland. Virtual worlds just don't hold the allure they did in 2003-2009, while VR is really taking off for industrial/business solutions.
Honestly think SL, even Blue Mars and Sansar are heading the way of Playstation Home.