This particular topic comes up every once in a while (often in "what-if-they're-right"-type threads), and I always post the same way:
The WTS has stated explicitly that it intends to be around to administer the New System (i.e. be the government), with the Warwick compound serving as the de facto planetary capital.
Now, imagine the Org being given control of a small country tomorrow.
I guarantee you that within a decade, advances in science and medicine would grind to a halt, democracy would be nonexistent, divorce would be illegal, any form of alternative sexual expression would be outlawed, creationism would be mandated in schools, virtually all forms of outside entertainment would be banned, disfellowshipped individuals would be imprisoned or deported, and "apostates" would be sentenced to death without possibility of appeal or reprieve.
(IMO, anyone who denies this is either hopelessly naive, or lying.)
Now, visualize this regime encompassing the entire planet.