There are billions of us. We cannot all be capitalists and start our own businesses. Literally 100 years ago American socialists like Olive Johnson were already pointing out how the profit motive from large players has ruined mom and pop shops and made medium businesses almost completely beholden to production and finance monopolies.
What do you think will happen with the increased production from AI? Will the capitalist just allow the masses to compete openly with them?
I doubt it. Most likely more monopolization will occur.
Small business owners are the tip (retail) of the massive whole-sale industrial-production monopolies or they are artisans at best. And the masses are the rest of us, the 95%.
Western suburban mentality always posits that these ills cannot happen, even though they were continuously happening even through out the 20th century (Detroit is just one example).
And the "regulation" argument is very popular but I feel it ignores the real problem for us: there is no democracy.
With the regulation argument you're basically hoping that one of the two parties full of billionaires, that we explicitely do not control, shoot themselves in the foot.
And as to adding value to the chain, that is what workers currently do, thats why they get paid. Which is what sparked this argument. The economy is not infinitely flexible, not all will be able to adapt, and according to the rules of capital the adaptation will be competitive and exclusive, so many people will be left out.