No, there is no limitation to ink jet. Obviously, "high impact" is subjective, but everybody seems to get what is meant, namely high dMax, gamut ...
I did consider the traditional Fuji solutions (As I would have to use and pay someone else's 11880 machine for the 50x70 prints, it would also be, in my particular situation, substantially cheaper to go the Fuji-Crystal-Archive-Super-Glossy way). The prints, as far as I can tell, do not compete anymore with the best of ink-jet printing, but maybe I'm wrong and somebody can show figures.
Regarding dye ink, I don't remember having seen a large format dye ink photo print.