That is an unknown! What is known is that all EAs will have a period of profits and a period of drawdowns. Even if the EA shows in a demo account that it has been profitable over the last week and it is moved to a live account, there is still always the possibility that it could immediately start going through a period of drawdown. Keep in mind that drawdowns always start after a period of profits, and profits always starts after a period of drawdowns. It is a known fact that drawdowns are a healthy evil for the future of a profitable trending market. I always look at drawdowns as an indicating the market is going to make more profits in the near future.
Good discussion!