One out bunts would be a messy data set. It'd consist primarily of pitchers bunting, but there would also be some position players bunting mostly for hits in there. Like you implied, very few pure sacrifices.
I don't think the bunt for a hit will ever become obsolete. But I do think sacrifice bunting will, if the DH is adopted. For the one situation where it makes sense, it probably isn't worth the trouble to prepare every hitter to be able to bunt. If a batter bunts only in that one situation, he will likely bunt about once in a season, in which case the likely outcome will be a bunt popup like we saw (twice) recently.
