Each discipline in cycling informs the others. The more disciplines a rider engages in the better the rider is overall. It is a bit of a "Jack of all trades- Master of none" scenario- but, only temporarily. A rider can still specialize in, and excel at a specific form, like track racing, but it is almost garauntied said rider will perform better on the track if he or she has spent considerable time in the dirt, or on the road. Engaging in multiple disciplines also helps prevent burnout, and boredom from setting in. There are reasons for the distinct seasons. You don't own a mountain bike, cyclocross bike, track bike, and road bike? Take the road bike off the road--"mixed terrain" riding, as long as the terrain is something you would deem safe, is fantastic- yeah it's a little harder on a flimsy carbon frame with tiny 23mm tires, but try throwing some 25's or 28's on that whip. It's also good to get over that overly delicate superclean roadie sensibility.
and yeah, this will happen from time to time.
