Re: Rank-Aikido (pun intended)
What say I sir? - methinks you're going to be off a lot of people's Chrissie card lists...
On a more serious note, I think the problem is not so much rank aikido and tanking uke's so much as a lack of self-assessment on the part of the teacher and the old "who's gonna tell the boss he's wrong" syndrome - which can easily lead to ill will and banishment to the nine hells of aikido.
You'll always get this problem in any group, not just martial arts, if there's a predilection to a top-down attitude without any outside constraints or objective criteria (yes Peter et al, I know, competition!).
I think the only solution in most cases is a "masterclass" where those who normally teach become students again within a constructive (and probably respectful) framework of honest and open critique.... next on we'll have a demonstration by the Barnsley flying pigs stunt team