Welcome to the site. I can tell that you're putting a lot of thought into this possible change of direction. Here are some opinions:
1) Yes, that's a problem and it requires a lot of persistence in some cases to be accepted into a program. Part of the issue is that there is a shortage of nursing faculty (with the qualifications for teaching, nurses can often make more money in other facets of nursing).
2) At least in my experience, it's blown out of proportion. Good, thorough charting is necessary for numerous reasons, but in my job, I still feel like my primary job is patient care, not pushing paper.
3) Salary and shortage/no shortage will vary widely by your location. Check www.salary.com
to find out what nurses are averaging in your area.
Good luck with whichever path you take.