A few things go against the T:S line. 1) the movie wasn't as well received as T1 or T2, 2) they did so many T-600 variants, it was a bit too much, 3) in today's market, likenesses are so heavily scrutinized and the John Connor portrait isn't the best of likenesses and could hurt the desire for the Connor figures.
This T-800 strikes me more like the Wolverine figure, but with even more going for it. Wolverine, though it can work for any of the X-Men films, is based on a movie that wasn't well received, and the likeness is a bit iffy, but it's very well made and the figure is still very popular and highly desired despite the strikes against it, and now it can be hard to hunt down at retail. The T-800 seems the same to me, a very well made figure, but in addition, the likeness seems stronger, and the movie more popular.
I imagine not only will a lot of people probably want and buy this figure, but a fair number will buy multiples with intent to make the various looks of the T-800. I've got 2 on order, I know others here are looking at getting multiples to make his various looks.
Just say that to appease...