Their being in another galaxy helped as the Ascended beings in our galaxy would have fought them if they came straight here. Instead the Ori used their followers to wage a war and convert people to their religion so they could gain more power and kill the Ascended beings here. Though we did recently learn that a weapon designed by an Ancient ascended (commonly known as Merlin believe it or not) could kill an Ascended being. It was made and sent to the other galaxy and we've been told (from an unreliable source unfortunately) that the Ori were killed. But just because they may not be there anymore doesn't mean their followers are going to give up.
Well, if I had had any on me when I came here it would have been confiscated. Given the rapid travel time between Gate that does make sense. Especially given we've learned that the Gates can cause time travel. I got to experience it first hand years ago when we were sent back to 1969. I wish my friend Daniel was here to talk to you about the Ancients. He's pretty much the expert on them. But I do know we have found some of their technology and that there is a specific gene in the human DNA that makes it so someone with this gene can use Ancient technology. Speaking of that, we did find a city the Ancients use to occupy in another galaxy, the Pegasus galaxy. The city of Atlantis believe it or not.