Honest question...what is this data and where is it coming from? Disney handed out paper RS passes. Were they recording WHO was using the system and why? They saw the too short kid and they handed out the RS...were they recording any kind of data when they handed them out? As people handed them back in and used them...were they recording anything like how many people were riding on each pass, or what time they were used? I just don't recall seeing any data collection in the line as RS passes were handed out and collected.
At the most, Disney probably knows how many were handed out each day, and how many were handed back in. But, is it possible that we are overestimating how much real and viable data Disney actually has on RS?
Ever since FP+ and
MDE they should be able to have a good sense of who was "double dipping"
They know who is traveling together and they know the ages of the kids (which is a reasonable approximation of height). It's easy to see that mom has a FP for TT and dad has a FP for Soarin and the group has a 3 year old. They also have the longer distance FP scanners so they can see that dad went on TT through the fast pass lane even if it's not officially scanned. And, they have the data on how many RSs are given out and used each day. It won't be perfect data, but **if** they care about this oh-so-minor issue, they could certainly get a rough idea.
But here's my question: for those who want everyone in a party to have a fast pass before using Rider Swap, why do you want the 4 and 5 year olds to lose out on a fast pass?
Mom, Dad, and 9 year old want to ride Space Mountain
4 year old isn't tall enough (but does have a very expensive ticket and should be entitled to use her fast passes for which she's paid.)
In your scenario, here are the choices the family has:
Mom and 9 year old get fast pass for Soarin, Dad and 4 year old get fast pass for Living with the land.
Dad doesn't get to ride Soarin at all, because he had to use his fast pass accompanying 4 year old, and he isn't eligible for a rider swap because he never had a Soarin fast pass to begin with.
So now rider swap has lost benefits, and the family goes home and tells their neighbors not to bother going to WDW until their kids are all older.
OR...
Mom, dad, and 9 year old get fastpasses for Soarin. 4 year old doesn't have an adult with a fastpass to accompany her on any other ride, so she effectively doesn't get to use that fast pass. (And family also has to figure out how to "waste" her fast pass so she can move onto the 4+ fast passes with the rest of the family.)