Should I include Naval combat units in my military strategy board game?

Pros:

More strategic depth.

More realism.

Cons:

Adding more water to maps means the maps need to be bigger, perhaps 48x48.

Defender's Advantage may become too big to advance the game.

Current units:

Worker - Harvests Gold and Oil. Very weak in a fight.

Commando - Standard infantry.

Tanks - faster and tougher than Infantry

Aircraft - Sacrifices some toughness for extreme weaponry and mobility.

Aerial Transport - Move infantry and tanks around faster than their own movement points allow.

Should I include Naval combat units in my military strategy board game?
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