There are parallels between JWs and Roman Catholicism. But the similarities are not necessarily indicative of a guarantee that the two religious systems are sisters or cut from the same cloth.
Roman Catholicism itself is actually one of three branches of the historical original Christian church, which includes not just the Roman Catholic but the Oriental and the Orthodox churches as well. There was even a fourth, the Jerusalem Church, made up of Jewish Christians, but it dissolved after the Romans crushed the Bar Kokhba led rebellion (what became of the last Jewish Christian bishop, Judah Kyriakos, is unclear). As a consequence the road traveled by the Roman Catholic Church has never been one it followed alone, nor has it had as much control of its destiny as it might seem to some.
Because the West has exercised such great influence in world affairs, and most of us here participate in the Western world culture, Roman Catholicism seems formidable. But just as the baseball World Series is just a championship among American baseball teams and not of all the various baseball teams on the planet, the power, control, and place held by the Roman Church is somewhat a matter of perspective.
Roman Catholicism has been shaped by her Oriental and Greek Orthodox counterparts, and even Judaism affects the way the Roman Church moves about. This has changed doctrine considerably in the 20th century, especially with and after Vatican II. Her religious trajectory has never been her own to mark out or determine, especially today where laypersons often wield as much power and authority over church affairs as clerics.
Because it has no historical links or counterparts, and especially since it believes it has destiny ensured by the Almighty in opposition to the world around it, whatever similarities the Watchtower has to Roman Catholic Church parts at a critical junction: the Governing Body does not bend.
The churches, on the other hand, do bend to the winds of change. Standards and morals even alter. The churches, after all, do not consist of hierarchy alone. They consist of people. When a pope dies, there is still a church, and church can exist without a pope. But a pope cannot exist alone. Shepherds without flocks are just men standing around with sticks.
The Governing Body is different. They are like the LDS prophet and the leader of the now dissolved WCG, Herbert W. Armstrong, and that idiot who is still running E-Bible Fellowship despite his last two predictions for the end of the world failing miserably. These types will shout alone on a street corner as the world passes by and mocks them. They are the ones that hold those "The End Is Nigh" signs and those who write ranting blogs that nobody reads.
Often they attract followers, but sooner or later the show ends. When the guy holding up the sign dies, unless someone is stupid enough to take their place, it ends. And even when someone does pick up the sign, eventually people will realize the sign is old and worn and has never been right.
I cannot promise that my words are surely prophetic here, but some people run religions because they believe God has assigned them to. They will act as a pope even when there is no church, develop a hierarchy even though there are few or none to wield over. If sheep do show up, they hit them with their rod instead of lead them and protect them with it.
Jehovah's Witnesses are religious lemmings. Should the leaders run over a cliff, those following will do the same despite the cries of pain the others make as they crash to their painful death. The Catholic Church may have more faults than I can list here, no doubt, but I think the trajectory of the JWs is just a repeat of something else that will end up being a byword.