Also in that time software developers have mainly gone from gods who could do the impossible because nobody understood how these damned computers worked, to code monkeys working on a production line who should quit moaning and finish already because I could do that in ten minutes.
Women don't tend to thrive in that environment and I doubt they'd even want to. The problem is down to poor management and they'll never accept any blame. With software development homogenised and outsourced I can't see women making a rush any time soon.
Especially as you say they would need to catch up with people who have been messing around with computers for years. Girls do use computers/phones/tablets/3ds as much as boys now, but the majority don't seem to care about how they work.
The second world war was the last big shift in women taking on jobs that had previously been male oriented, so short of an outbreak of a disease that kills men and not women then IMO the gender balance in software development is going to stay where it is.