Wow, you guys seems nervous and impatient, let's calm down and think about it a bit. I don't know how many of you notice this but team NTR always faithful to it's theme from beginning to the end especially the game that they put 'theme' into game name. About the tease that Marina might leave her husband, they do this before in Marina 2 and the game itself came out as vanilla-tier.
Not to mention, they intend to make Marina a big series , in short, they plan to milk it hard and judge from Marina 1-2, they knows the reason this series was popular so I doubt they will turn this game into generic Netorare game soon or at least not with Marina 3.