The problem is that it is possible the Maker doesn't exist at all or it's not what the Chantry says it is. We have no data on what the hell the Black City is, so Corypheus ascending to godhood by going there is impossible to prove.
That is speculative and since we did not see what would happen that is not fair game. Just what we saw from the game. Corypheus definitely has the manpower and the planning to rape the weaklings from Hyrule. Hyrule will know fear.
In all fairness it have never been a subject that have even been remotely touched in the games, and only lightly in the comics. I know that the various nations each can bolster a navy, but that is about it. Their size and capacity is unknown, atleast to me.