This post is old now, but I would have him come to a tourney and see you guys in a match. Hell, even pay for his admission. But I know I would be more apt to coach a team if I had seen them perform first.
Paintball is definitely not dead, but I do think people are seeing it less and less as the thing they go do on a random saturday.. Thats just what I have noticed from the people who used to play every weekend in my area. Its sad, but it will never go away!