Given the probability that you will not actually make a million, I think that this is a false goal that will only lead to frustration. My plan is to utilize my savings, after having got out of the 10 year rat race, to do something I enjoy (that also has a fair chance of being big). If it turns out that I make a million, well and good, if not then atleast I've been enjoying the money instead of leaving that to after retirement. The rat race is always there if I feel the need to go back.

Addendum: I also believe pretty much anything you do for the next ten years has a fair chance of being big. The only problem I see is that you're constrained by having a family and so might not have 10 years to fritter away like that.