If revolutionary society can get to the point where no 'state' of any kind is necessary (a communist-type gift economy), *very* quickly, then the whole transitional dictatorship-of-the-proletariat phase could be skipped altogether. This would translate to a *very* broad-based revolutionary upheaval worldwide that is all on-the-same-page and simply swamps the elite and their goons within a short period of time -- a few months, and less than a year. This would be the *optimistic* possibility, of course.
If that *doesn't* happen and something more along the lines of my scenario at post #4 takes place ('dotp'), I don't see how the workers state / apparatus *wouldn't* cease to exist after a finished, successful revolution, no matter how long it takes. (The historical facts of the unsuccessful Bolshevik Revolution and its devolving into Stalinism were due to invasions by the Whites.)
In other words, 'Nothing succeeds like success.'
A successful proletarian revolution would reach the point of generalization of socialized productive methods, and so the people and workers themselves would have the proper social environment in which to self-organize -- the workers state / dotp would become glaringly irrelevant in the absence of a continued class foe, and would have nothing further to do. (Consider that in terms of *numbers*, the formal workers apparatus would be a *subset* of all revolutionaries, and all revolutionaries worldwide would be lesser in numbers than all workers and people together.)
My concern with your statement, and any similar line, is that it's too presumptuously *pessimistic* concerning the results of a workers state as a potential *strategy* for dealing with the bourgeoisie. If actual conditions objectively call for a monolithic-scale implementation of workers power then that's what's socially-necessary and anything *less* than that would be insufficient in the context of protracted battles with the forces of the bourgeoisie -- we wouldn't want to shoot ourselves in the foot, and any concerns about the 'leadership' (for lack of a better word) would have to take a backseat to the need to confront bourgeois forces at a comparable-or-superior magnitude.