If we really do get to the point where society doesn't need low skilled workers we ought to start giving out a guaranteed minimum income. If we don't care about the potential disemployment effect the case for it becomes a lot stronger.
No, a dollar for dollar reduction in benefits for outside income does not "give some incentive to people to get jobs", its gives a disincentive to people to get jobs. Working has a disutility -- otherwise everyone would do it for free -- so if you have a choice of $X from a minimum guarantee with no work or $Y from work and $min((X-Y),0) in subsidies with work -- you have a net disincentive to work for any Y not greater than X by an amount sufficient to account for the disutility of work.
Benefits that reduce with income are how a lot of current programs work (and have worked for some time), which is why various complicated measures to try to combat the disincentives that structure can create have also been built into them (which further increase the administrative costs), and one of the key motivations for unconditional basic income is eliminating the problems that that causes.
Better to give a guaranteed income to everyone, and then let wages get as low as they want. The upside is that it changes the incentives so that work that is necessary (but undesirable) becomes more highly compensated, whereas work that is desirable becomes less compensated (and/or working for free becomes something that isn't just the domain of the wealthy).
> much less equitable than other (perhaps more invasive) quality standards.
Such as?