GaelicDragon said:
How much would the Nanoha series change if Nanoha's parents demanded that she graduate from high school or college? They aren't stopping her from doing magic, just from working for the TSAB until she has graduated from school at a level they agree to.
Either way, I don't think she'll be able to participate in events in StrikerS like she did before.
If the restriction is high school, then she'll be Vita's underling since she have less field experience. Subaru won't have her hero worship since canonically, the airport fire takes place 4 years before Strikers, which make Nanoha - who's 19 in Strikers - 15 at the time and thus, still in junior high.
If it's college, there's a chance she won't even be there depending on which college and which department she went in. (From what I gather, many colleges require at least 3 years to finish the course, and since highschool graduation age in Japan is 17-18, she will be at least 19-20 when she graduates, and thus missing out on StrikerS event.)
Either way, this creates quite a snowball effect since it's very likely that Nanoha won't be there to adopt Vivio, leading to someone else doing the job.