I agree. Unfortunately, alternative solutions are bound to bring a lot of new problems, making life of one of the sexes significantly harder than the other one's. I think the current system is decent for most standard cases. It can be exploited though, and women probably have more opportunities to exploit here than men - no argument here.
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The only problem with this is, if the man, say, doesn't want children in his life at all and he is told by his partner that she is taking the birth pills, while she actually is not - his life might become miserable because of the deceit. I definitely think that in such cases the liar should be held accountable before the law. And the child, perhaps, should be taken care of by the government, either finding an adopting family for it, or raising it by its own means, in modern facilities with professional nurses.
Of course, again, it can be said, "If you don't want children, don't have sex". Seeing how sex is such a big deal for most people though, I don't think this argument is going to get through.