I must admit that I have never watched any of Mr. Cowell's productions. That probably makes me the only American over the age of 60 who has not. But I am familiar with his work through the yapping of the TV "news" media about who has won what, which is what passes for journalism when news is seen as entertainment. The quoted blog from Jet Black (is that a real name, and isn't he afraid that a negro porn star will rip it off?), sounds like the rumination of a slightly bitter old man (to which I can relate) who has labored his whole life to reach something like stardom (of which I have no experience whatsoever), and now is being largely ignored (at least he is not reduced to posting in a music software miscellaneous forum).
The distinction between the "professional", or the "artist" and the wannabe, is one that aging rockers should approach with caution. There are many who would view a few decades of drugs and groupies interspersed with the occasional paid performance or recording, as something less than an admirable artistic career. And of course one can speculate that even the most successful popular musician was at some point a wannabe.
But he clearly overstates the significance of the Cowell phenomenon in the history of music. Talent shows may be the launch pad, for a very few great new talents, but they are clearly not the future (or even the present) of popular music. They are a somewhat more artistic version of the football game, deriving more entertainment value from the competition than from the performance. If anyone watching these circuses was truly interested in hearing the best new music performances available, they would not be watching a game show on TV. They would certainly not be listening to the carefully selected losers, who are there to provide "drama" pathos or comic relief. People who want to hear the best new music are certainly not buying large numbers of CD's of the losers' performances.
And if his point is that media attention/merchandising/connections can elevate performers to a popularity they may not have otherwise achieved, well I give you the Monkees (circa 1966) or Miley Cyrus (circa 2009), who did not need to win anything except perhaps an audition.