With a broad brush, There is no aiki in modern aikido. Aiki is the defining difference between modern aikido and Ueshiba's aikido. It really is as simple as that.
NOTE: There is no assigning blame here, no pointing fingers. History isn't as neatly packaged to give a clear answer as to why aiki was never taught. In his later years, Ueshiba doesn't seem to have clearly taught it at all. But, then again, was he teaching it but in his own spiritual terms and words? Throw in different eras of Japanese history, Japanese culture, a World War, etc, and you get quite a mixed bag of events.
I don't disagree with anything you said, but I'm not sure what value the fire and brimstone aiki talk is going to have long term. Everybody who had "something", put in the time to get it. While we talk about Shioda, Ueshiba and others and this sub-10 year mark, those guys trained for like 8 hours every day to get what they had. Now granted, one can cut that down significantly by getting rid of allt he fluff and tradition in transmission methods that htey had to suffer through, but still, we're talking about a LOT of training time to get to that level. How many aikidoka today do you really think will put in the time? Considering the work involved, why would anyone assume that the ratio of people who get it vs. those who just do waza will be any higher going forward?