I see Kendra in the back and she was released. I think that release line with Kendra ended the line period and those figures were no longer being produced. The last few series with all the articulation looked aweful and I don't think they were selling as DST would've like and it might have been the downfall to the buffy line. Also the figures were not marketed widely like in walmart or target and it was with select distributors or you had to hit a comic shop to get one.
Had they released the second wave of willow figures, the series might still be continuing. But either the problem was the sales of the figures or that the license had expiered prior to release.