One Snappy Scenario:
Noob 1: Ah mer gordon i made a houze.
Noob 2: Whoa a hoose can i donlode it plz
Noob 1: Sour hear u goo
Noob 2: *posts epic house to forums and gets loads of praises*
Noob 1: Oi m789 i maid that houze nawt yew.
Noob 2: Proof it m789!
*starts noob war III*
On the other hand, it's actually a unique and creative idea that can help players expand on their builds. However, due to the fact that most builder applications are started by showing off builds in creative, as well as the fact that arguments over who the rightful owner is, in addition to the fact that this would be very hard to do suggests that this really isn't likely to happen, at least without enough demand for it. I personally wouldn't want this, as players would just download their friends or builders plots and claim it as their own, showing off and beign smug in the lobby. This will cause unnecessary tension, spam and arguments and upset more players than help them.