That's all true, I'm just saying that I don't think the ascended would have been able to hide the galaxy forever. It might have taken a very long time, but eventually the battle would have been fought. Who's to say how it would have ended if SG-1 wasn't there to stop them?But if Vala had never blown her's and Daniel's cover, then they could have spent their time quietly learning about the Ori from the other rebels with the Doci and others being none the wiser. Then when the SGC finally got them disconnected, Daniel and Vala would be back with all that information, and as a bonus the bodies they temporarily inhabited would hopefully not be burnt alive. (I really didn't like that part of Origin, those two getting killed because Vala couldn't keep quiet )
If it wasn't for the Doci finding out that Daniel and Vala were from another galaxy, would the Ori have ever launched their campaign against the Milky Way, if they hadn't bothered to do so for centuries?