This is misleading. In the era of JetBrains and its perpetual licensing and Steam and whatnot, it's worth pointing out that ST3 is a binary that you download and have complete access to, so of course it will be there next year.
You're probably getting at the fact that development may stop on it next year, and that's true, but the product is still pretty polished and useful now.
I also don't have your confidence that Emacs will always be there. I don't have statistics - but have contributions been increasing or decreasing in the last decade? In any case, I hope that Emacs fades away: text editing is great, but I think there's still plenty of room to advance our craft. Things like Lamdu and Eve (nee Light Table) are interesting explorations.