I'd be interested to know whether it woudl be the government (as currently with SMP) or employers picking up the tab for this.
Currently the real cost to employers from maternity leave is the woman's absence. SMP is almost entirely covered by the Government, entirely for small employers.
If employers have to pick up the tab, women will lose out. For example, my nanny is the age where she might have children. If I knew I had to pay 20 weeks of full pay, I quite literally could not risk taking someone on who might do that. Childcare already takes in excess of 50% of my salary (won't say exactly), so once I'd paid that and a replacement I would be working for severely minus figures.
The same effect would be felt in lots of small employers.
I also think it's hard to do this when most EU countries have far shorter mat leave than we do. UK employers would be getting the double whammy of time and cost.
It worries me that it could be a negative step for women unless the government is paying. And can they afford to?