Everything ends. It is just a matter of when. We hear this story of Second Life™ ending all the time. It is not new. Lots of Chicken Little. That SL has not ended, does not mean it won’t. The sky COULD fall. But, I think we will have plenty of warning should the end draw near.
I came to Second Life from Myst Online, which has closed and come back a number of times. So, I’m used to games I like closing. Rizom is another one I liked and played for a time. It too closed and came back. Others just closed.