Our player base has dwindled to 1/5 of what it once was.
We can hardly fill 18 player content without 1-2 hours of waiting.

Server Merge? Too easy. Eventually 1/5 of that will disappear as well.
So what can SE do to really revive the game, give it a strong breath of longevity?

The Light suggestion:
Unlock All merits. No more Category caps.
Why? We're at 99, ilevel 100-120. What can you give us? More ilevel 150? No, that'd require more content... A quest then, an epic quest to unlock all of our MERITS! Incorporate that failed LEGION content and call it "Legendary Adventurer". Make us play it. Win it. 1/100 of players have won it. Thats absurdly bad. Give us a reason!
As for the Meritd uncapping; Will it change the way we play the game? Yes!
Will it be game breaking? No, not really.

The Hail Mary suggestion.
It's time, don't you think?
Let's uncap that subjob.. We're already loving what we see in Monstrousity. Just give it to us already.. If Monsters are already main/main, go for it! Give it to us completely!
Who knows! We might even surprise you with what we do with the additional power! Players would return! They really will! Main/Main?!

Those jobs that were vital, they would come back! And those jobs that required superb gearing would no longer require it if combo'd with an alternatively well geared job.
Example:
BRD with no Ghorn/Duardabla = NQ BRD
BUT a 99 WHM/99 BRD = Superb Support.
Or a
99 BRD/99 WHM with Ghorn/Duardabla = Ultimate Buffer/Support.

For those that have REM, they'd benefit more. And for those that don't, they lose nothing that they don't already have but gain a functional /99 second job that allows them to perform just slightly below the REM.

How say you?