Lacrosse will continue to grow rapidly across the country at the grass roots level. It will never be huge like football because it doesn't televise well -- following a small ball across the length of the field is difficult, much more so than hockey, which is on a smaller playing field. The sport must be viewed live on the field to be fully appreciated.
Furthermore, I think some HS football coaches may begin to realize that lacrosse is by far the best Spring sport for overall conditioning and coordination skills, and may begin to encourage their football players to take up the sport. Serious injuries are relatively uncommon, and there is a place on the lacrosse field for almost every type of athlete.