I can see your point NoApologies and I would agree there is no simmering rebellion about blood in the ranks. What there is however is an institutional inability to just drop certain doctrines. The irony is that they can change things like the generations over and over again, modify the F&DS etc. yet cannot bring themselves to bring some sense to the table on blood, birthdays and so on.
I do think that the hubris and pride in the upper echelons of the organisation prevents them moving unless reality forces an issue. I am still of the opinion that the potential legal risks also play a part in the reluctuance to simply drop the blood restriction but can see an argument on why there could be alternative views on the impact of this on their intransigence.