Put it this way, there are a ton of great mods for the PTO ( Pacific )of SH4 and folks will continue to mod that side of the game. Because the U-Boat side SH4 is still relatively new naturally it is getting some more attention, and will continue to as eventually it that side of the game will be opened up to include the ATO ( Atlantic). But the PTO side of things is just to great a sim now, so don't expect it to take a back seat, lots of folks are and will continue to play it.
It's a great time to be into the series, there seems to be something for everybody
RDP