The titling of these things is what keeps a lid on their potential value. It takes a brave man to plunk down $50K+ on something he may not be able to get on the road in his state.
If SEMA were writing the universal laws for all states, it'd be fantastic. But SEMA doesn't write laws, and therefore anything "universal" is likely not to work in anybody here's favor. Gear heads in general, and replica fan-boys in particular are not a class of people likely to sway the DOT's trajectory.
We can barely get it done at the state level, and there only sporadically. There's almost always a way to get a replica on the road, but it's pretty skippy sometimes.