I see at least as many women unwilling to commit as guys; I don't know the answer. Women always think they can do better and won't settle, guys are afraid to lose all they've worked for in the courts.
The best advice to give women who want to get married is:
Dont wait until youre in your 30s.
That's completely true. But if a guy asks a girl to marry him, and she says "no" or "not right now -- I'm not ready to commit yet", I wouldn't blame the guy if he started dating other women to see if he can find someone who may be ready when he is.