Law firms and "part-time" predicament

Interesting piece from the National Law Journal on how law firms are dealing with the desires of various attorneys wanting to go part-time, particularly after the birth of a child. The story references law firm Kirkpatrick & Lockhart Nicholson Graham and its new "balanced hours" program. Their program allows an attorney who demonstrates a need to propose alternative working arrangements such as working fewer hours or telecommuting. A book entitled Solving the Part-Time Puzzle: The Law Firm's Guide to Balanced Hours is referenced.

The way I see it the solution to the problem is starting one's own law firm. When I have children I would expect to simply be working from home more than I do currently. I'm not sure why it doesn't seem like we've seen the same entrepreneurial explosion by female attorneys that appears to have happened with female entrepreneurs in the rest of the business work.