Not sure how much you watch TNT, but his insight about most teams/series and the basic philosophy of a successful team are pretty spot on. Not sure if you caught the transcript of his interview with a local radio station that made it onto AZcentral, but most of his takes on the Suns were pretty accurate.
Did you learn anything from his analysis, or was your reaction, "Yeah, that's what I was thinking too?" If the latter, then what makes Barkley more qualified than you? The ability to say things that resonate with a knowledgeable fan base isn't a qualification.
I don't know what the GM job entails, but we can assume that it's some of the following:
* long, disciplined work hours
* good teamwork skills
* sophisticated financial sense
* the ability to be "poker-faced" about what you really want, for example when working out a trade or negotiating a contract
* willingness to accept criticism when things don't work out well
* intuition for balancing short-term and long-term goals
I could go on, but I think if you ask yourself whether Barkley could even
develop most of those skills -- much less already have them in hand -- I think you'll see why I'm pretty sure he'd be a disaster.