i love the "instantly parrotable experts".
If you think about it, most of them have not earned their ideas the hard way: they are indeed parroting things that sound like they might work but often aren't applying them. (And I will put my hand up to doing that sometimes. But then again I am really hesitant to call myself an expert except in very few obscure fields.)

I like the definition of an expert as :
"Someone who has made all possible mistakes in a very narrow field" I think someone who has done this probably has a shot at acquiring true knowledge. Provided they are willing to learn of course.

I think that the value of being an expert, except for some perennial fields like human related subjects (communication, persuasion, psychology, coaching etc.) is going to fade fast unless you can combine your technical expertise with other relevant fields and skills.

As a society we have been told that we need to specialise and gather more and more knowledge of an ever narrower field.
I think most progress is going to come from the intersection of different fields, combining disciplines by people who are willing to look over the fence of their expertise and remix their ideas with others to generate truly valuable ideas. "Experts" who remain in their technical box might find that all of a sudden their expertise became worthless or abundant.