Probably the biggest obstacle is that the thread puts the cart before the horse. "Incentives" - which, as I've said, always contains the unsaid adjective "monetary" - in the form of wages are seen as the magic that makes a worker work. It is, in fact, quite the other way around. The existence of a working class produces wages, as a way of administering the very bare minimum of their survival. In many ways, a wage is an obfuscation of an obfuscation; namely, that labour-power, the capability of working, has been turned into a commodity for purchase and sale - its value becomes murky and unclear, the struggle being moved on a different ground. Instead of the question, why are we all on the labour market, the new one is why am I getting a lower wage than XYZ? Now, the anticommunists here will leap out and say, a-ha, here's an example of man's innate cruelty - here's why the only way to keep the peace is by having jackbooted thugs that break necks and crush skulls. History, however, seems somewhat more ambiguous. There are just as many examples of betrayal - for an example, the way the German working classes stayed inert once they got their precious Weimar Republic; or the white, racist and exclusivist unions in the U.S - as many examples of solidarity cutting across chauvinist lines in union strikes, anti-war demonstrations and defections.
Someone will, likely, also opine on the fact that wage labour has existed in Antiquity. That is fair enough - but unfortunately, there's one issue. One's purely quantitative - for every pot made by a Roman craftsman who baked the clay, painted it over, sold it, etc, one has to assume that there's a thousand other pots made with slave labour from the quarry to the workshop. The second is still relating to the mode of production - again, here, the existence of slaves precedes money. You can have all the money you want, but you cannot buy a single slave if they're not on the market. The main circuit of exchange here is around the sale and purchase of slave labour and nothing else; it is the dominant, determinant mode of production.
I await your sincere, good-faith and reasonable contributions and comments to the thread, as always.