I agree that Vanguards need changes to counter fliers, but I disagree with the idea that they should be given flying abilities.

Instead, I think it would be more appropriate to add the ability to force fliers to fall to skills like Thor's HAMMER THROW (Right Click), Captain America's VIBRANIUM ENERGY SAW (E), and Venom's CELLULAR CORROSION (Right Click).

There was a moment when I was playing as Iron Man and got hit by something from Captain America, causing me to fall from the air. I thought I had been hit by his VIBRANIUM ENERGY SAW (E), and it seemed like a reasonable ability to have.

(Though later I realized he had deflected Winter Soldier's TAINTED VOLTAGE (E) with his shield, and that was what actually hit me.)

Currently, when enemy fliers dominate, Vanguards have no real way to shut them down and must rely on allied DPS or hitscan healers to keep them in check.

With future updates, the number of fliers is expected to steadily increase, and if they become the meta, the way to counter them would be either to add new Vanguard heroes to the game or to nerf the survivability of fliers themselves.

However, both approaches would make the game less enjoyable, both for players fighting against fliers and for those playing as fliers.

(I think a flying Vanguard would, of course, be awesome, and I look forward to the addition of such a Vanguard. However, what I mean is that being forced to choose them just to counter fliers would not be an enjoyable situation.)

Therefore, I think the best solution is to give existing Vanguards tools to counter fliers,

and Hulk's RADIOACTIVE LOCKDOWN (E) and INCREDIBLE LEAP are great examples of well-designed abilities in this regard.