By the by, I seem to recall in one of the first two books the statement that the Wardens know where all the Old Gods are. So they know what countries they are likely to surface in. Given their "we live to stop the blight" philosophy, just what are they doing in these other countries where it is unlikely a blight will surface other than maintaining their own political power?
Part of it is because the Deep Roads stretch from everywhere to everywhere, allowing the darkspawn to theoretically hit anywhere. They know where the Archdemon is likely to hit, but not where it's going to. And then there's the minor darkspawn raids, for which Grey Wardens are nonessential but useful. And of course having branches in every country means reserves in case of disaster. But yeah, yeah for all they say they're politically neutral I think that it's also partially maintaining their own political power. I'm not denying they're sketchy, merely that they're worse than not having Wardens and that there's any system that can be set up to replace them. (Yet.) Which I think we're agreed on anyway.
As for the secrecy: again, I see its value. Though I agree there should be someone who knows the secrets and is empowered to keep them honest; one major recurring theme in this series is that people with power and no oversight (or no effective oversight in some examples) tend to go off the deep end.
If Alastair is a fair example and he became king, within ten years he offers sanctuary to the mages knowing that the Mage - Templar War is going on then does absolutely nothing to protect either them or his people. This is troubling to me.
In his defense, the fact that he arrives (apparently backed by an army) as you're forcing Alexius's surrender indicates that he was gathering armed men and women to protect his people with as you were solving the problem. As for protecting the mages, he did advise them to settle near what we're repeatedly told is less a castle and more The Castle. Eamon and Teagan take as read that it can hold against Ogres and Emissaries, and it's not facing anything like that scary this time. While I'm aware the mages thought they needed more protection than that, I'm not entirely sure they did.