Reading cursive is a skill, and like any skill it will degrade unless you practice it. I never read cursive in my day-to-day. All of my books are printed. I never see cursive except in signatures and everyone knows those aren't meant to be read so much as recognized.

I would struggle to read historical documents because I'm used to reading print. I learned cursive in school but never used it. With cursive, it's hard to tell individual letters apart and I end up guessing what a given word is based on factors like length and "standout letters" like "T" and "G".