I am aware that changing anything about this is a lot of work, HOWEVER:
This is, while complicated in execution, in all other regards, a fairly straightforward fix.
Every single user will have a better experience with better multithreading.
The game will run with higher settings on most machines.
CPU architectures lean toward more and more cores, this has to be done at some point.

On my setup I get about 30% CPU load. When fps start to go down, that number decreases, indicating that a single thread is clogging up the pipeline.

Please Bohemia, make this a, rather THE, priority.

Lots of content is great and all, but everyone favors playability over additional content.
Besides, you already have lots of funding because the alpha sold so well.

We don't care how long it takes to finish the game, as long as every big issue, such as this one, is addressed.

Don't make the same mistake SOE did with PS2 - they promised optimization and it never came. Meanwhile, the playerbase ran off.