Since Jeremy has stated his intention to release future code changes only under Copyleft, the decision for Wine contributors to make is a simple one: do you believe that the benefits of potential additional corporate, closed-source adopters of Wine outweigh the certain loss of code contributions from Codeweavers, a known active contributor?
Even so, since the LGPL is a one way street, remember that it might not always be so in the future.
If we choose LGPL there is no turning back. Remember that always.