There is a simple solution to this.... Region dedicated servers. Have some servers in NA and Europe and leave the current servers for Asia. Yes i'm talking about splitting the players into their own region.
This will reduce lag a lot and also NA and Europe won't be affected by these blackouts. It might seem unfair for the Asian players but from a business point of view it is better to save 2 regions then penalize everyone. In it's current state FFXIV can't afford much more down time....