Not stalemate. I get that Namor is the stronger guy here and some don't want to admit he loses. But plain and simple he is poorly suited for Aokiji. It's only a matter of time before Aokijj used ice time or something like it. Also Namor gets constantly weaker on land. He would eventually be much weaker and have to get back in water to replenish himself. Of course Aokiji cant go in after him but he could freeze any lake, sea or ocean, either preventing Namor from doing so or freezing him inside.
@taichokage: Namor's body is made for surviving extremely cold temperatures. He was strong enough to knock the Hulk out and trade blows with Sentry. I see this as a stalemate, neither can do anything to each other.