An initial problem I see is that "autonomous base nuclei" is such a terribly odd sounding phrase that it is almost impossible to imagine it really in practice... But I'll try to demystify it.
a) Other examples that come to mind for me are the recent Occupations, and any oppositional campaign that is self-organized and not geared toward political solutions (i.e. it tends to use direct action, not limited to property damage). So, to throw some random things out there, maybe Idle No More, or resistance to the US-Mexico border, or various forest defense encampments, or resistance to coal mining in West Viriginia, and probably a few dozen more.
A necessary caveat: Many or most of these struggles have seen and will see partial or total recuperation into the channels of negotiation, representation, politics. So, by the standards of I@ theory, the autonomous base nuclei have not ever entirely been--or were but have not remained--autonomous. But the point of recognizing this isn't to demand purity, instead it would be to realize a "tension in practice."
I@ wants to stress that people involved in so-called intermediate struggles can often organize autonomously from unions and political parties, can resist representation, can refuse compromise or negotiation with power, and can directly attack the structures of power/capital, even without being anarchists. And that anarchists can act within and outside these bodies. (We don't have to stick to our own anarchist groups and hostile opposition groups like trade unions.) And that when we engage we want to further these groups' autonomy, self-organization, and refusal of compromise (e.g. agitating to the local Occupy that politicians not be permitted to speak at our assemblies, that we not seek political solutions to our grievances, etc, etc).
b) I don't know anything about that history specifically, but history as a whole would definitely indicate that all such experiments have failed, that recuperation into politics always happens. For some, this leads to an indictment of recuperation specifically as if it could be separated from the rest. For some, it leads to an indictment organization as such. For some, an indictment of history or progress. For some, it leads to giving up on everything, even experimentation.
c) I do think I@ is essentially reliant on a lack of social peace, or at least on the belief that social peace is a lie or facade laid over a reality of deep social tensions and points to apply interventionary force. I have observed insurrectionary morale--but also anarchist morale generally--rise and fall with the waves of general upheaval and general submission, and no surprise there. With that said, I think times--and places!--of decompression are good opportunities to decompress, to take space to relax, reflect, rethink, clear spaces, act in secret (and I don't mean that as code for sabotage), and be open for whatever happens next.