Brad defined that moment, paraphrasing Mandel, as taking shape in the postwar world. Marx (and Althusser) said that the industrial revolution is actually more like it--ie labor does not own or set in motion the means of production (in a mundane sense) at this point. Open-ended skepticism is probably to the point in this circumstance. (ie. an empirical argument about when capital really became capital). Else, you're left with a kind of hollow messiansism a la' Derrida--ie the end of capitalism is "to come" but you don't know when, etc. Of course, there are also lots of practical messianisms at play here also, but with huge swathes of India and Africa (to take two non-random examples) yet un- or under-proletarianized, it's hard to see how capital might have reached its zenith or to be significantly more at risk as a system now than, say, 30 or 40 years ago.
Christian