I think the issue is... FH2's fate was sealed when it stopped "evolving". When a mod is "done" (talking in terms of gameplay, not actual content) it will only ever attract players already familiar with the games that offer similar gameplay (usually older games, as players will naturally try to find the next-gen game that offers the same / similar gameplay they are already familiar with).
That's how mods actually became popular in the first place, as previously new sequels of games from the same franchise did not come out almost every year and the only way to get "the game you love, but better" was to install a few mods to make it better).
Now in FH2's case that pool of potential newcomers has shrinked to a minimum. BF1942 / FH1 / BF 1943 / RO1 and its mods are all effectively dead and there will seldom be anyone new coming from there.
Unfortunately I have recently realized the "window" where FH2 can experiment with new gameplay options (introduce new game modes / refocus on different mechanics / try to attract a different audience) has closed.
Any changes now could potentially be devastating to the existing playerbase because "old fans" will not agree with them, and besides that the potential dev pool has also shrinked to nothing, which means there is effectively no manpower that could bring FH2 into the "next decade".
I believe the last chance was about 4 years ago when PR went standalone. That was the "last blaze of glory" of the good old BF2 engine. The devs missed that opportunity because they didn't want to risk having legal issues with EA. And somehow the cross-promotion with PR was also not very successful (or taken advantage of), although it did provide a small boost to player numbers.
So FH2 is destined to become the next FH1, eventually the community will take over and focus just on adding new fronts / maps and rehashing old content in previously rarely seen / unseen combinations.
Of course, it will still be religiously played (eventually only on weekends) just like FH1 / FHSW by a small contigent of die-hards and nostalgia seekers.
The only way out would be for someone to start working on FH3 and eventually attract new devs and new audience... That way the old community could move on, the old fans would come back and potentially new players would flock to the "next iteration" of the gameplay they all know and love.