Even if expansions aren't planned, that would be an interesting route to take with Silent Hunter. Other sims that I know of (Rise of Flight, Railroad Sims) add other vehicles and features in expansion formats. It makes sense, at least in my mind, trying to support a niche game has got to be costly so why not develop smaller add ons that people can pay for if they really want them. True, people would probably complain that these "added features" should have been in the initial release, but paying 10-20$ for what someone spent 100's of man hours on would be worth it. Not to mention extending and improving the life of what was a good base game.
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