Will Frictional Games make more Sea/Air monsters?

[The chaser]

It's an interesting purposal. But, I think the problem doesn't rely on making them. It would rely in the path nodes.

How are you going to make an aerial monster move into the air and such? What if there's an obstacle?
And the water monsters:
It would be almost the same, but the player would need to swim.

Amazing ideas, Rock Worm