Being a great race probably was less reliant on technological development and more on cultural development. Chances are there weren't any threats that would have neccessitated a military alliance and the sharing of military technology (until the Ori came along anyway, since the Ori were too far away (and, more relevantly, not even vaguely considered when the Torment of Tantalus was written) and either the Ancients or the Asgard could have defeated the Goauld but for the replicators/being ascended), and it doesn't exactly seem in the asgard character to go around asking for technology at random. As for the Nox and furlings, I doubt the nox have any kind of useable military force, again, due to racial character, and if the writers decide to pull the furlings out of their rear ends to save the galaxy's arse, it'll be among the worst deus ex machina's in Sci Fi history, and will seriously damage my rezspect for Stargate (the appearance o0f the Ori already sort of has, to be honest).
As for Morena Baccarin, could be bad, but it probably wont be. She's juilliard trained, and reckon she could pull off the kind of semi ridiculous overacting an Ori oracle would need to do.