Oh of course, but something tells me Berkman is going to try and get his ring and jet. The going rate for 1 dimensional DH's is like 5-8 million. Here's a few: Manny, Thome, Berkman, Konerko, Branyan, Damon, Magglio, Dunn (he thinks he's still a position player) and so forth. Posada would be a horrible full-time DH. Yanks need to go get a high OBP guy that mashes HR's. Posada is not that guy.
Part of me hopes that next season he'll bat .336/.426/.543 like he did in '07, but the likelihood of that is slim to none. Posada retiring would be like a part of my childhood/teenage years being retired. I'm sure you feel the same thing and you're thinking with your head, but Jorge pulled out some great performances I'll never forget.