Baseball Prospectus takes a look at the impact of the Soriano non-trade...(and this is in the free section, so even if you haven't subscribed, you can read it -- scroll down to the second half of the page...)
Their take, in essence, is that the Rangers would have been better served dealing Soriano and letting Kinsler take over at second, because the difference in production between Soriano and Kinsler doesn't outweigh the enormous cost savings by letting Soriano leave, which could then be applied to other areas.
In other words, they agree with me...