Anecdotally, I have at least 7 family/friends that were RNs at some point and moved on to other professions or dropped to part time. Zero of my family and friends are still full-time RNs. They cite a combination of reasons: risks from patients (moving overweight people, assault from patients, verbal abuse from patients/families, etc), increased workloads that threaten their licenses, and cost of childcare. And this all occurred before COVID.