As an amateur handwriting analyst, the main difference between people who write in print vs cursive is that they tend to be more emotionally withdrawn or repressed, and have a greater need for clarity and directness. So, one could argue that just learning print will cause a greater trend in kids who aren't as in touch with their emotions and lack the ability to detect subtleties.

There have also been psychological studies that show that kids who write predominantly in cursive have a better handle on grammar and sentence structure, as they are thinking of the words as whole instead of going letter by letter.

Also, for those of you who say you write in a combination of print and cursive, graphologically speaking, it's a very positive trait that shows the writer is able to adapt well to situations, is a fluid thinker, and can get a handle on the details as well as the big picture.