Marx makes the same point in Value, Price and Profit.
“They ought, therefore, not to be exclusively absorbed in these unavoidable guerrilla fights incessantly springing up from the never ceasing encroachments of capital or changes of the market. They ought to understand that, with all the miseries it imposes upon them, the present system simultaneously engenders the material conditions and the social forms necessary for an economical reconstruction of society. Instead of the conservative motto: “A fair day's wage for a fair day's work!” they ought to inscribe on their banner the revolutionary watchword: “Abolition of the wages system!"” (p 93)
The contradictions arising from capitalist production were only taking shape, in 1800, when the utopians were setting forth their observations. The first, generalised crisis of overproduction of commodities did not occur until 1825. It was another quarter of a century before large-scale industrial capital asserts its dominance, and another quarter century before that large-scale industrial capital, predominantly, takes the form of socialised capital, in the shape of the co-operatives and limited liability companies that flourished after the passing of the Limited Liability Act of 1855. So, the Utopians could not see such development, and the means of achieving their goals. Rather, they relied still on the pervasive power of reason and belief that, if only society could have its eyes opened to such reason, a harmonious development could be undertaken.
“During the Reign of Terror, the propertyless masses of Paris were able to gain the mastery for a moment [and thus to lead the bourgeois revolution to victory against the bourgeoisie itself]. But, in doing so they only proved how impossible [it] was [for] their domination [to last] under the conditions then obtaining. The proletariat, which was only just separating itself from these propertyless masses as the nucleus of a new class, and was as yet quite incapable of independent political action, appeared as an oppressed, suffering estate, to which, in its incapacity to help itself, help could, at best, be brought in from without from above down.” (p 329-30)
The Utopias dreamed up were incapable of becoming real, not because the productive forces were not developed sufficiently, but because there was no reason that the capitalists were going to voluntarily abandon their own advantages and position as ruling-class. In 1800, it was still the case that many of the private industrial capitalists were former skilled labourers themselves. The majority of production was undertaken, still, by petty-bourgeois, independent commodity producers, like the hand-loom weavers But, as the fate of the latter showed, described by Marx in Capital I, those conditions were rapidly changing, as machine industry drove them out of production, and concentrated the means of production in the hands of private capitalist families, whose lifestyles were transformed along with it.
Marxist theory is not a theory that starts from the individual seeking to turn each one into a clone of another. So, of course, some of these individuals caught a glimpse of the future, but Marxist theory, historical materialism, is a theory based on the interests of given forms of property, and so the behaviour, in aggregate, of the social classes based on it. That some of these individuals did obtain a glimpse of the future, albeit expressed in their various fantastical forms, is still a mark of their own genius.
“Saint-Simon was a son of the great French Revolution, at the outbreak of which he was not yet thirty.” (p 330)
That revolution was carried out against the old aristocratic ruling class, a class of parasites and idlers that leached off the great mass of society engaged in the production of the nation's wealth – the Third Estate. But, this Third Estate was soon revealed to, in fact, be a contradictory whole, comprising, at one pole, the rising bourgeoisie, and, at the other, the emerging proletariat. Much as with the political revolution in Britain, in which the bourgeoisie conducted its struggle for political rights and freedoms, whilst drawing behind it a large mass of petty-bourgeois producers, and the emerging proletariat, as symbolised by the gathering in St. Peter's Fields in Manchester, it soon became apparent that this political revolution was one that the bourgeoisie sought to contain within strict limits.