Don't get me wrong, I'm all for it.
But, I'm one of the thousands of people who have paid voluntary payments to make up for the gap in their National Insurance record. That option, by the way, is open to anyone not paying NI compulsorily, such as a full-time mother, and it can be done later, when she is back at work. Furthermore, a lot of the women pensioners, who are not receiving full pensions, voluntarily elected to pay the lower NI "married woman's rate" when they were working, knowing that it would deprive them of a pension.
That's not to say that the present system is fair to women who are full-time carers, but the fact is that it is possible to get a full pension even if you have gaps in your employment, and there will be a lot of people who took care to cover those gaps feeling they might as well not have bothered.