I think the implication was meant to be that there will be far more people who are both programmers and domain experts than there currently are programmers?
Domain experts often don't need to do anything "innovative" - they just want to schedule their team's workload or some-such that's been done a million times but the details of their particular situation are important. Most programmers now are doing such things for domain experts as it is. One possibility (I'm not 100% convinced) is that AI would allow the domain expert to do it directly, i.e. become a programmer themselves.
Domain experts often don't need to do anything "innovative" - they just want to schedule their team's workload or some-such that's been done a million times but the details of their particular situation are important. Most programmers now are doing such things for domain experts as it is. One possibility (I'm not 100% convinced) is that AI would allow the domain expert to do it directly, i.e. become a programmer themselves.