Idea is to transfer characters (one per account) to the new world when the old one ends.
Yes, it may sounds awful for the first look, 'cause it would put titans and newbies in one place. But it would also keep players motivated to keep playing no-matter-what. For now i personally know a bunch of people who don't wanna get into the game 'cause "the world is too old for the fresh start, it will collapse right when we'll build our homes". And i guess there are much more of those, who don't wanna make a fresh start or to start over after the first character was lost.
Now new characters can inherit some skills from the dead ancestors. So let's just kill everyone (huh) at the world's end and let characters in the new world inherit as usual.