On the subject of offending, the United States Tennis Association has many rules but the one they post on their tennis courts, at least around here, is “You shall not say or do anything that may offend anyone in any way” (my underlines). My response is, “Your sign offends me; therefore, in abeyance of you own rules, you should remove the sign.”
Life is tough! The Seals do not lower their standards to accept people who, due to fault of their own, are not able to meet their high standards. As a result, Seals are some of the most respected warriors in the world. When you lower rank testing standards, you get what we have today—people who wear black belts, not people who are black belts. Professional sports teams do not hire lesser qualified players or keep them around after they have past their prime because they have had a tough life.
Once a martial artist cannot perform at the level required for promotion, they should not get promoted. This does not mean they should lose their current rank or that that should drop out of the martial arts; it just means that they will have to stay at their current rank. As stated in the Peter Principle, they have reached the highest level of their competence, or incompetence as the case may be.