What...?
That doesn't make much sense to me.
I feel that the opposite is true-- if you're not ready to get married, you're not ready to have a baby, but that's sort of obvious.
If people have been dating quite a long time, and love each other, I don't see why they shouldn't get married. Getting married doesn't cost like a child.
Like me and my boyfriend have dated nearly six years. We've lived together for three, and have no serious problems. Sure, we'll bicker occasionally, but people do that. We could get married. I'm still in college, and we live comfortably, not luxuriously-- but we're definitely not ready to have a child. I couldn't afford that yet, not until I'm done with school.
I don't see what the financial ability has to do with getting married, though.