I voted NO.
If i had the option id say HELL NO.
If ubisoft was to make Silent Hunter 6, they would most assuredly use SH5 as a base, when they need to start over from scratch and build a new game from the ground up.
Think about this:
Silent Hunter 3 was great, but it wasn't perfect. It had a few unresolved issues of its own.
SH4 was built upon SH3. It retained some of the unresolved issues from SH3, while introducing some bugs of its own.
SH5 was built upon SH4. It retains some of the unresolved issues from SH3, AND sh4, while introducing some new bugs of its own.
SH6? Can you imagine the bug ridden clusterF*** this title would be? it would most likey retain unresolved issues from all previous titles and introduce new bugs as well.
No thanks. Time to let it go, or start over from scratch - which ubisoft will never do. It would take too much time and money for a nitch market game. So with that said... I think its time to let it go, rather then go down the path that a SH6 already has laid before it.