Based on what criteria? I think you need to go back and read the message you replied to. Either you misread it, or overlooked important points within it.
First, I don't see the change from TechTV to G4 as being a positive change
Who gets to impose their definition of "core" audience? Clearly, that's something you must defer to the broadcaster on. They get to determine who they want to aim their service offering at.
I see both as negative changes in regards to their core audiences.
Where is your citation to that assertion of fact?
Changing from "SciFi" to "SyFy" will certainly confuse and alienate a dedicated core audience devoted to science fiction, one of the largest audience subsets today.
I think you're going to need to differentiate between people who like fantastical storylines and science fiction fans. The stats count these people together in one group, but as a self-proclaimed representative of the first group, I'll tell you that the changes that the name change to "Syfy" reflects represents a substantial improvement. Those changes will get me to watch Syfy more. And yet you'll find that all the surveys about who likes what will count me together with science fiction fans, who will abhor the further move away from hardcore science fiction.
And neither of us know how many of that "one of the largest audience subsets" you referred to are like me versus being more like the hardcore science fiction fan. However, it is NBC/U's business to know, and from their actions it seems like their research indicates that there are far more of me than them.
Again, you're making an outlandish generalized qualitative statement, without regard to the fact that your personal preferences don't apply generally. Where is your citation to the objective facts that TWC is earning a lot less money now than they could have been making if NBC/U didn't acquire them? If you don't have that, then your comments along these lines are easily ignored as baseless.
The NBC acquistion of The Weather Channel isn't turning out to be very positive either, so I don't see a rosy future for "SyFy".