I read through some of your opinion on the matter. For instance:
Did you mean prescriptive dictionaries in the part I bolded?
Since practically all general use dictionaries are descriptive and since I’m pretty sure that the lexicographers understand language at least as well as you do, you’re simply wrong if you meant descriptive.
If you meant prescriptive, then your argument is out of scope since prescriptive dictionaries are targeted at a narrow field of users, say like how Black’s Law Dictionary is for lawyers, and are unlikely to much influence the language of people outside those fields.
I will grant, though, that all dictionaries are at least five years out of step with current trends in language at the moment of publication.