Libertarian political theorists have similar disagreements. History is filled with examples of both slow and sudden changes. The enlightenment ideals carried on by John Locke took centuries to develop, yet the American Revolution institutionalized an essentially Lockean form of government within a few short years. Socialists were quite adept at focusing their theories into the New Deal of Roosevelt. The Big Moments in history rarely take place because of the plans of any single person or group.
Social forces can build for years or centuries before events reach a head.
It remains an open question, however, whether we as libertarians should work for incremental change or try to help pave the way for those rare monumental changes. Browne's plan entails selling off public lands to buy annuities for current Social Security recipients, and ending the tax all together. Now, that's a fairly radical plan, and one I happen to love because it kills two socialist birds with one stone. But I understand Bumper doesn't like the idea because it somehow legitimizes the concept of Social Security benefits as a right. Thus, Bumper advocates sudden repeal, while Browne's plan is relatively incrementalist.