losing a ride can be overcome by renting a car. in a situation where 3 people are dependant on the 4th to drive and bails, why not rent a car for the day. granted, sometimes it's hard on a long weekend or if the driver bails the night before the game but if it's the morning before a game than why not rent? take the cost of the rental and divide it amongst the 3 remaining. hell, you might even be able to break it down one more time if someone needs a ride home after.
this might not always be worth it for some to attend a skirmish day but it's certainly worth it for a milsim.