If a school owns the aircraft I would say that caring for the aircraft is taught from the beginning, and as such I think they take more care in who they hire to teach.
Saying that tho, someone earlier made the point that 30 years ago people might have been taught by retired military pilots. I'm sure this would have been good for stick and rudder and a number of other skills, but without a doubt the MOST dangerous pilots I encounter in the air are guys trained around that time.
Guys 50+ who own their own aircraft and fly just enough each year to stay
Unsafe.. Blasting through the cct without a care, long conversations with each other on busy ctafs about how nice the weather is , non standard procedures etc etc
No offence, that's just my experience..
Until the pay becomes better, most instructors will be on a path elsewhere . Doesn't mean they can't do a good job while their doing it..