Depends on what the real question is here. If you mean when will it end as in completely shut down I don't see that happening for a good 10 years after it stops being updated. The fact that rs classic is still running proves this. As long as they can make some money off it, they will keep the servers up.
Now when do I think we will stop seeing updates? I think the latest would be 2016. Honestly see it being more around 2014-2015. They've already said dungeoneering was to tie all the skills together and have stated that dungeoneering will be the last skill. Whether they will go back on that statement is a different story. We are also seeing a ton of end game content. This doesn't mean there isn't plenty of low-mid level content to be added, however, I don't see much more high level content being released, which will eventually start making high leveled players quit. Which isn't exactly a bad thing, I remember 5-6 years ago when seeing someone 120+ combat wasn't all that common. Now it's more common to see a 130+ player than someone who is lower than that.
This is all speculation of course. Who knows, in the next year jagex could release a ton of amazing updates that end up prolonging the games lifespan tremendously.
Also to the person who said the investors are just trying to suck as much money out of runescape as they can needs to think about it more logically. What would be better, a game lasting 3 years and making 5 mil a year then it dies, or a game lasting 10 years and making 2.5 mil a year then it dies.
Obviously the numbers are inaccurate, but the point is, their money is already invested. To just suck money out of rs and kill it as fast as possible makes absolutely no sense when they will earn more on their investment the longer runescape lasts.
Edited by Envy Moi, 06 April 2012 - 07:24 AM.