Seriously? Who? NB instructors could check out as captain and then continue instructing at captain rates. Most WB instructors that I’ve dealt with are there because they really like widebody flying. If it was 90 hours with no 9 year cap I doubt they would leave. 90 hrs as a WB first isn’t that much different in pay than a junior NB captain, you sleep in your own bed every night, guaranteed home for major holidays, and you can cherry pick where and when you want to fly. It probably sounds better to most people than sitting reserve or flying a bunch of 2-3 leg per day 4 day trips with red eyes mixed in them somewhere.