Sano's chances of sticking at 3rd base are less then 50%, him being at least an average defensive 3rd baseman is less then 30% at this point, also he is still a long ways off... period. Assuming that he is the long term answer at 3rd base at this point would be a mistake.
I love how we haven't had a legit 3rd baseman since Koskie, and suddenly some feel that a half of a season from Plouffe (I think he sticks offensively, but defense is a question), and Sano are suddenly all the depth we need.
Dave, no one is saying ignore the 3B problem. But to continue in your logic, we haven't had a decent middle infield since 1991, and that makes 3B look like nothing. I don't buy into your logic on Sano not sticking at 3rd. While I don't ever expect him to win any defensive hardware, he's going to get every opportunity he can to stick at 3rd, as there will be no room for him in the OF, and I'm not sure there's going to be room for him at first either.
What I am saying is that Plouffe is an acceptable stop gap for the time being and could, (if the bat is for real) be a long term fixture there until Sano is ready, at which point he can move to 2nd, but that is absolute best case. In the mean time, we still have 0 decent middle infield prospects that could be contributing by 2014 and very little in the pipeline that could be useful by 2016. If this team wants to contend in 2014-2020, they are going to need to have above average production everywhere. Olt doesn't improve that problem.
If we are going to trade with Texas, Olt isn't the target. It's Profar, Buckel, and Perez.