i dont think Naval Tradition has any place in Commerce. that or i think it should be defined as Naval trade routes are not disrupted by enemy units (or worked water tiles are not disrupted). No longer losing gold from barbarians or war time units would be a direct benefit to gold. the +1 movement/sight is a bonus but i think it has nothing to do with Commerce. It might fit into Honor, but that tree is pretty good as is.
And i think Tradition needs to redefine Oligarchy. It should read: Units stationed (not garrisoned) in Cities cost no maintenance and Cities with Units stationed there receive 100% combat bonus.
And if im not mistaken, the happiness from Aristocracy doesnt come until you have a minimum of 10 pop. I think it should +1 happ from citizens from 1-10, 11-20, etc. and only for settled/annexed cities, not puppets.
I also think Aristocracy should lead into Monarchy, Landed Elite lead into Legalism, and Oligarchy staying in its own slot. It might not still be as powerful as Liberty, but the timing of getting Legalism and Landed Elite become more valuable.