Youkilis is going to turn into Lowell 2010/Michael Young 2011. He will play a little 3rd, a little 1st, a little LF, and a little DH.
The kid is a top 50 prospect in the MLB, the Sox top prospect, the future 3B, and he is hitting .310 with a 1.070 OPS, and has just 3 fewer HR than Ortiz in less than 1/3 of the games.
He is 6th on the team in HR, 7th in RBI, and has played 10 of the teams 34 games. You cannot touch this guy because what he is doing right now is clearly working. The absolute last thing you want to do is move a 23 year old middle of the order hitter to a different, unknown position where his ABs can be affected by his defense.
Look, you've struck gold with WMB. Why would you change that for an aging player who hasn't hit well since July of last season, is on the DL often, can't play very good defense, and is likely a clubhouse problem based on his attitude.