Full Idea
The a priori/a posteriori is still taken seriously, and has had new life breathed into it by the work of Saul Kripke.
Gist of Idea
Kripke has breathed new life into the a priori/a posteriori distinction
Source
report of Saul A. Kripke (Naming and Necessity lectures [1970]) by E.J. Lowe - The Possibility of Metaphysics 1.1
Book Reference
Lowe,E.J.: 'The Possibility of Metaphysics' [OUP 2001], p.1
A Reaction
The distinction may be a good one, despite a blurred borderline. Did Egyptian quantity surveyors begin to suspect that Pythagoras's Theorem was a necessary truth, though they couldn't prove it? A priori understanding creeps into experience.