Mmmm... yes... if they have already located the Chitauri royal eggs, the personnel of Alpha Flight don't have much use anymore, do they? They are basically targets for the Chitauri and nothing more...
Carol Denvers could put them out of harm's way and focus on either destroying the Chitauri (she could recruit a small army of cosmic superheroes from other realities with America's help) or finding a way to move through the shield (have they already tried to move to another reality where the shield doesn't exists, land on Earth, and once on the surface jump back to their own reality?) so they can take the eggs away and/or defeat Hydra...