I think it makes sense to encourage women to consider doing a start up - yes for some women raising a family is the fulfillment that they want. But for those that do want to focus on a career, it's very possible to feel left out. Although (intellectually) you know that there's no reason why if this guy or that guy can do it, you can't - there's something somewhat sobering and potentially disheartening about almost everyone being "different" than you. As the years start adding, up its the same thing with age - I /know/ that I can do it, but there's that seed of doubt for one reason or another.
So I think it's a good thing to encourage anyone who doesn't meet the standard expected start up founder profile - whether it's women, or people who have been around the block a couple of times. They (we :)), might have good ideas, we might need to be reminded that can be done - and to be pointed in the right direction.