I see the Swordmage as the up-close-and-personal caster.Misty Step too.
Also, various Aegises did other things. So Arcane Power's Aegis of Ensnaring teleported the enemy to the Swordmage, allowing them to whack it instead of teleporting the Swordmage to the enemy to whack it (like the default Aegis of Assault).
Heh, even the "distance whack" feels too much like a ranged attack to me.
Sounds solid.If I was building a 5e Swordmage, I'd want to have all three Aegises as default core class features that all Swordmages could choose, rather than have them locked as alternate features behind subclasses. Maybe subclasses might focus on one or more of them, though.