Beyond Character Classes is an essay I wrote about turning class abilities into feats and then giving characters two feats per level.
That essay provides more information, examples for how it could work with Fighter, Rogue, and Wizard (and one archetype for each), examples for how the Witch and Ninja fit in, and even a sample character to show how the end result is flavorful but not overpowered.
Perhaps the many thoughtful folk in this House Rules forum could turn my essay's thoughts into something more complete and valuable that revisits and rebalances classes and feats for the enjoyment of many Pathfinder players.