Feyd Rautha
Prince
I'm torn on the issue. Yes, xbows and others are "siege" type units due to the ranged attacks, but they also consist of men instead of machines. It will stink to hold onto a bunch of promotions or lose them when rifling comes around, but it definitely adds a new level of consideration which isn't necessarily a bad thing. Also, I can't find anywhere where it says archers and the like cannot take melee promotions (many of the "ranged" promotions require things like drill and shock so you can hold off and get access to some of the ranged promotions that would help even a melee unit like Mobility or Volley [it does just say +25% vs. fortified after all])