Vacations? I know families that go to their cottage every other weekend. Should they only show up to meets, games or practices when it works out with their busy social calendar? What kind of family schedules vacations and social visits during their child's sports season?
The answer: One who does not value the sport and gives no value to the virtues of discipline and self-sacrifice that you are trying to teach. It's not so much about "family" as it's about the selfishness of adults who think the world should conform to their schedule.
If you have 20-30 kids on an average team, how do you juggle all their vacation schedules and trips to see Grandma? There are park district programs and some running clubs where no committment is required. Join one of those. Or run 5K's and train alone.
Only a very small amount of athletes actually do any running on vacation. That's why it's called a VACATION. Once they return, their fitness is reduced. Generally (and it varies for every person) detraining begins after three or maybe even two days off from running. After a week off from running, it can take as much as three more weeks to get back to the fitness level you had when you stopped running.
No matter how fancy you want to make workouts or strength protocols, you can't effectively train an endurance athlete who does not work consistently.
Coaches are unnecessary? It is the TEAM that is necessary. It has seemed to me that a kid who bought into the program of a poor coach generally does better than someone running on their own. Cross country is geared towards competition, not simple easy running. Teammates and the supportive feedback of coaches make the tough workouts possible, along with the pain that a runner will feel at some point in virtually every race.
Why do almost no national class American runners come from outside the high school and college system?
The answer: It is very, very hard to do this on your own.