I'm hoping they copy the whole 'Lost City / New Order' thing again to win some random battle against the Ori.
They're pinned down in one of the Library monuments and O'Neill just goes "Now I remember why I took the promotion. Aw, **** it", jams his head in the Library and starts rewiring the Ori weapons they've stolen to shoot big beams of blue death that chew up the landscape. Then he walks out, completely out of his goddamn mind, glowing with energy, flinging bolts of carnage at the Ori while SG-1 hose them down with Ori/Ancient beam-weapon staffs.
Have the Libraries as the Ancients' weapon-of-last-resort against the Ori - having put them there millions of years ago so advanced Humans could gun-shot the entirety of Ancient knowledge into their head and lead other Humans against the followers of the Ori.