There is something to be said about the quality of flight versus the quantity of flight hours. An unfortunate byproduct of the "1500 hour" rule has been the encouragement for students to obtain their CFI rating at 250 hours and "teach" students how to run around the pattern for 750-1250 hours.
Where 135 operations used to be a quality stepping stone for new commercially rated pilots to earn quality flight time, now the 135 minimums require 1200 hours to get started.
These high time rules and a lack of part 91 operations sufficient for time building opportunities is forcing pilots to become instructors whether they want to teach or not. This industry is particularly odd in that our instructors at the Private-commercial levels have some of the least experience in the industry. But we encourage this as a way to bridge the gap between 250 and 1500 hours in many cases.
I think the real solution is probably a mix of the comments here, but primarily a reduction of the part 135 minimums to allow lower risk operations to be conducted by pilots with around 350 hours. This would give some opportunities to build practical experience in the industry and allow pilots to progress towards the ATP minimums without the encouragement to log hundreds of laps around the pattern each month.
This would hopefully drive more industry professionals into the instructing world, and start a circulation of industry knowledge instead of this low level circulation of basic, and in many cases rote knowledge and experience. Encourage pilots to fly more routes instead of laps around the pattern.