1. Are instructors given a salary/wage that is commensurate to their length of training/financial commitment/experience?
Very occasionally. But still nothing that equates to the level of dedication and professionalism that got them their.
2. Compared to other careers paths, is the salary/wage for a position as an instructor attractive?
Sadly no. Once it was before the hours builders who would work for food and the log book time devalued the system.
3. Is the career path of flight instructing widely seen as a stepping stone to get entry into a career in the airlines?
Sadly yes.
4. Due to the inherent forces acting upon more experienced pilots to gravitate towards airline employment, is there a lack of experience in GA or flight instruction?
In some places yes. in others where you have proper career Instructors who teach for the love, you have a massive wealth of experience.
5. Do you think that many perceive a career in flight instruction as demeaning, or of lower prestige, than a career in an airline?
Sadly yes.