I'm not asking about dissolution of PLC as plenty of people thinks that even before union with Lithuania fall of Polish state was unavoidable due to various reasons (pure geography, climate, "Polish national character", Catholicism and other stuff). So at which point in history there was no slightest chance to avoid Poland or PLC being absorbed by neighbour/neighbours? If we are talking about mere survival of state, even in rump "vegetative" state I think it was quite late. Even failed state could survive on map if neighbour(s) are not vitally interested in eraseing it from the map (like Paraguay survived after War of Triple Alliance, because Argentinians refused Brazilian proposition of partition, preffering Paraguay to still exist as buffer) so even second half of 18th century could work (less capable Prussian monarchs, earlier reign of Paul in Russia and few other lucky events could give PLC enough time to survive until Napoleon, which may not be viewed as liberator in such circumstances). But what is your opinion?