Corypheus would remember Tevinter in the days where the worship of the Old Gods still ran strong. I have ventured down to his prison in the mountains to where the Altar of Dumat was, and in those days there would have been slaves; elves do not have easy lives now, 'twould be far worse for what he imagines. [Truthfully, former glory is the least of it with Corypheus after all he's done thus far but for so many of them it would be a grim reality to greet if he managed it.]

That does suppose the Maker has the power to do it, if he exists at all and is not a figment dreamt up by a madwoman. Andraste who might have been but a mage only with tales coming after. The Maker did not rid himself of his first creations that disappointed him, nor did he do much no matter what has come since the Magisters set foot in the Golden City. Perhaps they shall be disappointed and he shall simply not care.

[Of all the options, it'd be that one in her book. The Great Dispassionate Shrug did the Maker grant unto the holy, and lo did they drown in their tears ad nauseam.]