I for one am not going to replace my arnie. Too similar to what I have already and the cut out head piece is just a gimic to me. I wouldn't ever pose it that way.
1/4 is way too big for me. Part of the appeal of 1/6 is the size. Getting that large, detailed as it is, loses the amazement affect of "how do they do that?"
I totally agree with you on that! I have no interest whatsoever in 1/4th. I think it cheapens the look of a figure.
As for the DX T-800, I'll definitely be skipping him. I'm more than happy with my regular T2 T-800. That's a true icon on my shelf!