I think that for the most part, the quality of the art lineage depends mainly on the practitioner. I am quite sure that many sensei feel financial pressure to keep and maintain
students and reduce turnover. It is not the BEST of situations, but a reality if a person opens a dojo with the intent of making a profit or living from it. It would seem that of the many people who undertake any martial art, drop out rates are pretty high. I would not necessarily say that this reflects on Aikido itself, but more of a social issue. If we are honest, patience is not something Americans are famous for.
I feel that in any given issue, developing patience is what will truly make a serious student rather than what I see is very common today with many people "cross training" with dabblings in a large variety of arts.