When you look at those guys, they must have a terrible dose of Cognitive Dissonance, all of 'em. They have grown up knowing the "End" is near, but they know they are making up themselves anything about how near, but they still deep down believe the bullshit that we are in the "End Times", how painful that level of C.D must be to carry around !
Hence they have that "Bunker Mentality" , have found it keeps them going, and keeps their faith in the bullshit fairly strong, so they engender that mentality in the JW rank and file.
This IS a form of Paranoia , so a resounding "YES" to the question in the Thread Title.
As to this " or on some tropical island somewhere." I think this is highly likely, when you look at the income the Org. has had for many decades, they haven't spent anywhere near all of it. Hence, they are worried about Cash Flow all the time, but they are not paranoid about the Org. toppling, because THEY will be O.K !