Settlers has more originality than that... every single stupid multiplayer game has that setup these days. You want to stand out and do justice to the original and creative heritage of Settlers? Get rid of this quest setup.
Apart from the fact that it's annoying to constantly get taken from one quest to another (really, some free play is much more appreciated) it's frankly kinda insulting to think we need to be taken by the hand like little toddlers.
Think about it.