I don't know.
I could have sworn I saw a Twitter post by a dev implying that the Architect is of the same nature as Corypheus, and Gaider said in a fairly recent interview that one story draft of DAI involved you falling off Adamant fortress and encountering the intelligent darkspawn of Awakening instead of the Fade.
Plus, the devs lie and change their minds all the time. Just recently on Twitter Patrick Weekes advertised an interview he did by saying, "Listen to me lie through my teeth!" because the interview had been conducted before Trespasser came out and he had to avoid spoilers.
I could be wrong and the Architect could be gone for good, but if he isn't I'm not gonna get mad. Between Flemeth and Corypheus having perfectly plausible story reasons to survive the PC killing them, and the authors fixing Leliana's mandatory survival by revealing that worldstates where she was murdered by the Warden but still appeared in DA2 and DAI was due to being replaced and impersonated by Fade spirit, a la Cole, I no longer feel too invested in my choices to "spare or kill" supernatural characters like the Architect. If I did kill him, he'd probably come back anyway. If he doesn't come back if you kill him and I missed out by not killing him, that's a rarity.
EDIT: Besides, the aforementioned interview I shared implied that the intelligent darkspawn are still out there and will turn up in a future game no matter what. Considering how dangerous and psycho some of the Architect's followers are, I'd almost rather keep him around because he at least has some scruples and discretion (he doesn't UNDERSTAND mortal morality, but he'll act honorably just the same) to reign in the violent or destructive influences of some of his followers.