I have a problem with philosophical economics. Marxism has created an identity that incorporates both the proletariat and the capitalist in opposition to each other and has become a self fulfilling prophecy because of those identity economics. Your descriptions of ownership asset/labor are theoretical or did I miss where you went through the steps necessary to migrate from the present system to the one you envision? What economic model will produce this evolutionary economics where labor becomes capital owners?
A small mom and pop candy store works as an example of your process but where does a fluid economy exist where one can first acquire capital ownership? If you work as a waitress and are newly hired then where can you make a living as an owner of capital assets where longetivity on the job increases your take home pay? The new hire would not be able to make a living at first nor would working people be able to switch jobs easily etc.
Secondly this reminds me of the sacred peasant anti-intellectualism of the past. Where is the provision made for training doctors and lawyers and other highly skilled occupations as owners of capital assets? Aren't they already?
I think provisions to incorporate 'owners/capital labor' like a worker owned factory is certainly possible but not as a total economic system. In other words the future needs the capitalist/labor model of today plus the owner labor/capital you mention and also socialism and raw capitalism all mixed in together to fit a multitude of economic needs.
I don't believe in isms or formulas to govern society and both capitalism (free market or otherwise) as well as socialism are too 'ismatic' to work alone. Neither is enough but together we just might have what we need.