How can any actress really be a poor version of another actress? Just because they look alike? How does that even work? If someone told me that I was a poor version of someone else just because that person looked like me, I would kindly smash their face with my fist. Very asinine reasoning. Also, what is your intention by making such a statement? That Summer Glau should not be an actress because another actress looks somewhat like her? Or that the casting crew on TSCC should have cast the other actress in her spot, but were too cheap to do so? If this is the case, I had never even heard of that other actress before, but I have known of Summer since Firefly. Do you have anything to back up that Summer is the "cheaper" actress? Perhaps this other chick is the cheapy version of Summer Glau? I sure as hell bet she can't do "creepy" the way Summer can.
I hated T3, so any erasing of it is welcome to me. Every TV show has some crap episodes, it just comes with the territory. Also it not fitting in with Terminator Salvation doesn't bother me either. Chances are Terminator Salvation will be a pile of garbage too. Of course, their deep desire to get Terminator Salvation to mesh with T3 is exactly why they had Nick Stahl play John, right? LOL. Obviously the Terminator Salvation guys realized that was a painful miscasting, and were all too happy to "erase" Stahl as Connor by casting Bale. Personally, I hope Terminator Salvation is really good, and that its DVD/BD will find a place in my movie collection right next to T2.
To me, the TV show is entertaining, I enjoy watching it. So to me it is not a waste of time. They are making money off of it, so it is not a waste of time to them either. Much like Johnny said, if you are not enjoying it and feel it wastes your time to watch it, simply don't.
The obvious reasons for not having it connect to the upcoming movie are that the end of the TV show is still up in the air, who knows how many seasons it will get (hopefully not many, I'd say three looks like a sound number for this thing). And that the movie is to appeal to a larger audience, i.e. people who do not follow the TV show, but will go see the movie.