I think you don’t see more joint BSN/MSN programs because most nurses can get a good job with a bachelors. The joint degrees are often in fields where you need a masters to get a good job in the field or to be certified. Also, many nurses hope to have an employer who will provide subsidies for their grad classes. In addition, the better nursing grad programs probably want a nurse to have work experience before they are admitted. That certainly is true with nurse practitioner programs, some of which now require a doctorate,