The topic of this post seems a little off. The description of zipline on its github page is "financial backtester for trading algorithms written in Python" which is a bit different.
You're right that there is a chasm between backtesting and actual trading.
The title may be a little future thinking, we are working on adapting the event/stream-based backtesting engine to drive live trading.
Updating the description to help declare intended goals of being a wider algorithmic trading suite.