>Worker run cooperatives have not been particularly successful so far.

Common != Successful.

The fact we don't have many Mondragons probably has less to do with its intrinsic efficiency and more to do with pre existing wealth distributions.

>What would alternative be?

One change that Jeremy Corbyn put in his manifesto in 2017 was a law mandating one worker board seat for companies over a certain size.

I didnt think it was a particularly drastic change but it drove the big business lobbies into a fit of white hot rage.