Well, first of all, if working women are "condemning" other women to take care of their kids for low pay, then surely their DH's / partners are culpable of the same offence, what with the DC also being theirs and all?
Apart from that though, yes OP you have a point and I think it's a scandal that staff in nurseries are so low paid. For instance, I once had a Polish cleaner (in her early 20s) who I used to pay £13 per hour, I think. This is the going rate for cleaning and it's fairly easy for cleaners to do say 35 hours a week (e.g. she also did another 10 hours for my neighbour etc). So it's easy to get over £400 per week - and that's cash. She dropped out of her childcare NVQ because it dawned on her that she couldn't afford to be stuck doing fixed hours for the minimum wage?
Then her husband (who was a builder) said he'd clear our garden. He charged £25 per hour to her £13 when really unspecific gardening is no more skilled than cleaning. It's just that it's traditionally "men's work" whereas cleaning and childcare are not.
There is no point waiting for men to suddenly decide they want to work in nurseries or as nannies. If that was ever going to happen, it would have happened already. It won't happen because a) men are less biologically or psychologically inclined to be interested in this kind of work. In general it comes less naturally to them. b) many women do not trust men around their children in the same way as they do other women (unfortunately, but it's true).
It's exactly the same thing as waiting for a sudden momentum of women to go into construction jobs, building the motorways, working in heavy manufacturing and so on. It won't happen because most women would not want to do these jobs anyway.
Childcare always falls to women in general and the proportion of SAHDs is very low. Even where nurseries or nannies are not being used, it's it's grandmothers who step in - and do it for free! How many dads would think of asking their fathers to step up and look after their kids while they were at work?
Women and men will naturally gravitate towards different roles and there's no getting around this. We don't need more men in childcare - we just need to value female childminders more. Without them society cannot function. No job is more important than raising the next generation. Parents who put their children in childcare are putting their children's safety and lives in the staff's hands - literally. As a SAHM, I know it only takes a second for a child to put lego or something in their mouth etc. What job is more important than that and bears more responsibility?