Developers will benefit from some of the income, but won't get it all. This is because their initial benefit will draw more people into software development, which, if not coincided by an increase in demand for software engineers, will lower wages since it'll increase competition for jobs.

The poor will get poorer b/c they will have neither capital (money/development machines) and because eventually the rate of cannibalization of industries will increase over time. Software's eating the world, and that process is accelerating.

Machines alone won't be worth much more than the sum of their parts because they are mass produced and largely interchangeable, so there's a ton of competition in the market. They will still be under the control/ownership of capitalists because they won't be persons - everything that isn't a person technically has an owner.

When machines do cross the barrier of deserving rights, we should reconvene and have this discussion again.