I think that they should not only add a new trait, but also modify the existing ones.
Militaristic: Maybe wars should induce WLTK day as opposed to WW... this may be unbalancing, but it would be pretty cool. That way, both the government and the people are militarisitc, not just the govt.
Commercial: Throw in cheaper marketplaces/banks! That would make it a worthwhile trait (though I like it now, too).
Religious: Relgious civilizations should get a new govt type: Theocracy! Same principles as Despotism, except they get an extra unit with the advent of Combustion... the Fanatic. He could be a combustable unit that has a large attack but dies after combat.
If those changes are too drasitc, I like the idea of Fanatical as a trait. WW would be reduced substantially and drafting with no unhappiness... this would lead to a more militaristic civ, though we already have a trait designed for that. Also, I think their should be a Fanatic unit for them (as was mentioned before), but I think it should die after combat (kind of a suicide bomber sort of mentality).