Sorry, but I really, REALLY think artillery needs to be left alone. It seems to have become more of an aesthetic, rather than an actual, useful tool on the battlefield. Players are comfortable with the risk that artillery present, and that's what adds to the tension. Now if someone spots a cannon aiming at their line, it's completely irrelevant, as that cannonball will likely go spinning out of control in completely the wrong direction anyway!
I've already heard people in regiments saying they'll be leaving their artillery divisions because of this. Nerf of howitzer explosion range? Okay, maybe. Completely scrapping any kind of artillery useability? Please for the love of God, no. >.<