The unintended consequence of virtual lines is that people need a window to return and some won't return. Which is math no one seems to have figured out yet - as seen in the spike of FP wait times throughout the day at various rides.
Tapu is more fluid in that it's not promising a specific return time - from what we can tell, rather works like a restaurant and pages you - but how long do you have to return?
In a traditional park each slide of a group of 4 racers at most has a 5-10min wait. Why bother with tapu on those?
Will they?