Did we have a modder (or maybe a team) out there who want to take the task and bring halfway plausible ship traffic into the game?
Current state: Empty harbours,shore lines and rivers.
I would aim for a mod like MarineTrafficX for X-Plane: https://forums.x-plane.org/index.php?/files/file/43684-marinetrafficx/
Maybe it´s possible to get permission from the author of the X-Plane mod to convert and use his models?
One of the things I’ve learned a little about recently is that not everything from X-Plane converts to MSFS easily; and sometimes not at all. If I could get a look at that X-Plane mod, I might be interested in tinkering with it. Of course, I’m still trying to figure out how to convert the airports I did for X-Plane into the MSFS format. I feel totally lost with the MSFS SDK.
Be patient, i’ve read somewhere that GLOBAL AI SHIP developer are working on traffic adaptation to MSFS2020. 
Now that would be awesome!
Indeed! This was exactly what I was looking for.
Global AI Ship Traffic in MSFS that would be awsome!
Global AI Ship Traffic is one of the best mods for FSX.
I can’t wait to have it in MSFS!
Stay tuned ! it’s on its way
https://www.fsdeveloper.com/forum/threads/global-ai-ship-traffic-fsx-p3d-and-msfs2020.436946/page-20
Hehe…it´s all about patience.
Thanks for the link.