Thus, it's my opinion that calling these people meta-experts could imply something different than what you intend, particularly to people who don't read the article fully, and if it takes off as an Interblag "term", it could cause some confusion (although it could be that I'm just crazy).
Perhaps I could interest you in neo-expert?
It isn't the prefix that needs adjustment, it's the word "expert" that needs replacement.
And there is already a term for these sorts of people. Polymath
However, I agree that the word "expert" itself is rather disingenuous. Just like the term "hacker", it (as stated in other comments) is not generally considered a description one could apply to oneself, and (still just like "hacker") it means many different things based on context and user.
A good decision, in my opinion, would be to phase out use of "expert" except in instances where you want to imply that a person has a lot of experience in a particular area (so "he is an expert computer scientist" == "he has a lot of experience with computer science"). The term "professional" could be only used to label people who are what we currently call a "consummate professional": someone who is skilled in many areas relating to their field of expertise and to business and people skills in general.
Great point. The terms expert and guru (maybe professional too) are a lot like nicknames. I can call you those things, but if you call yourself that, I can't help but think the opposite.
If you find yourself justifying your answers with "because I'm an expert" on a regular basis, it may be time to reevaluate.