Just about every young male in America is into tech/games in some way though. The video game industry is huge and constantly growing. You can't say the same about fly fishing and bird watching.
This is true, but it seems that even networks that once focused on technology and science have ran into the same situation, forcing them to shift their format significantly despite technology and science being an even bigger topic and industry of discussion. Remember when The Discovery Channel and TLC didn't have reality and game shows and was truly informative information 24/7? The Internet ushered in the information era we're now living in where people will typically do a Google search on the information they want in order to get it instantly and succinctly before taking an hour out of their day to watch the same information delivered to them with pretty graphics broken up by 3-4 minute long commercial breaks.
They were constantly shifting their format during the early years (when the channel was actually good) since what they were doing was new and has never been done before. MTV was basically the same way during the early '80s.
MTV is a good example of what I'm talking about. Music television became less and less viable over the years, so it began to have original programming. Then it practically invented the reality TV genre (perhaps the most successful format for TV given how many people watch them and how cheap they are to produce) as we know it today, and now it's anything
but music. Music is a huge entertainment medium as well, but it became clear that a purely music network just wasn't feasible. It's sub networks dealing more in music is supported by the money MTV gets from its other ventures.
This is why I'd imagine shows like Icons, Judgement Day, Cheat!, Cinematech, etc, etc were canned. If they were successful, they would have been left on the air in favor of shit like The Man Show, Cops and other shows better suited for a network like Spike.
Networks don't change their format around just because they want to experiment with what works and what doesn't -- that's a lot of wasted money. They do it because they realize something isn't working, for whatever reason.
But video gaming is far more mainstream than it was back 15-20 years ago.
True, but is unfortunately offset by many of the things I mentioned above. 15-20 years ago I'd go out on a limb and say that a solid 75% of gamers everywhere who had access to such a channel would watch it. Gaming magazines were at the height of their success, and due to sites like GameFAQs and GameTrailers not existing, shows like Cheat!, Cinematech and Icons would have been a big deal to most gamers.
Now a 24/7 gaming/tech network has to compete with the ubiquitous nature of the Internet. And yes, this goes for practically any network, but when you take into consideration that most of the truly successful networks produce and air reality TV shows and serialized dramas that the Internet has yet to successfully corner (mainly due to it being out of the indie budget range), you realize that those are completely different situations.
I'm not going to say that a gaming/tech network cannot work at all in today's market, but it would take a smarter man than I (and those behind G4 apparently) to figure it out.