The WTS has no monopoly on providing a "crutch" for those who need one.
If the WTs were to collapse in a flaming fireball, after the initial shock wore off, most JWs would glom onto [some other religion].
Those who crave strictness and rigidity would pick some other high-control group - there;s plenty to choose from. Those who were in it more for the social aspects would join up with the Unitarians or the Methodists or whatnot.
I wouldn't worry too much about how JWs would react to the demise of the WTS - they'd get over it pretty quickly.