The save structures and systems for offline and online are completely different and so isn’t as simple as downloading a copy, it would need to read, translate, and re-write the data into the offline methods in order to work. This of course isn’t to say it’s an impossible task, but it would require a decent chunk of dedicated time to design and develop a system for it.
This isn’t something we’ve really discussed to my knowledge, so we don’t have a current stance on it. Like most anything - If there was enough demand for such a feature, it’s possible, but this of course competes with spending time on other features and content: so the demand would need to be high enough to warrant say, not adding a new crafting mechanic instead. But it certainly wouldn’t happen for 1.0 as we’ve already passed our content cutoff, so if the demand were to arise it wouldn’t be until some point after 1.0.
I also think it’s worth mentioning that this solves a problem in a way we’d rather not solve it. We’d rather have multiplayer reach a state where there’s no desire to transfer offline, than to implement a solution for people to go to offline - which we are very much hard at work on.