> The way we do economics depends pretty heavily on there being enough jobs for everyone, or nearly enough anyway
The way the current capitalist economy is premised on a vey narrow exclusively capitalist class, and a very broad primarily working class from which the capitalist class extracts value. (While there are some redistributive mechanisms in place, they largely are downward transfers from the more successful members of the working class to the less successful members of that class -- or those that are effectively excluded from participation in either capital or labor because of lack of resources for the former and lack of marketable skills for the latter -- because capital income is tax favored over labor income.)
However, the more capital intensive the production of value is, the less well this basic structure works -- the less the marginal production increase of additional units of labor provides given existing capital, the less real income can be earned from labor. Unless you more equally distribute effective ownership of capital (either by direct redistribution of capital assets, or socialization of the gains of capital through tax and benefit policy, or some other means) the whole system falls apart.
> right before the owners of the robots decide to murder the rest of us since we were complaining too much.
That's also a means of leveling the ownership of capital, if you think about it (but its only a short-term solution to the problems faced by the owners of robots if they don't still have a leveling mechanism working between them.)