You make an interesting point. Does Doe v. Bolton make abortion for ANY reason legal during any time of the pregnancy?
I suppose what may happen is that rather than changing minds on abortion, instantaneous viability of the fetus at conception, which is the theoretical limit that technology is approaching, will force the redefining of what it means to be born. Only then, apparently, will abortion be murder in the legal sense.
I even posted a source that has pointed this out this past week.