Maybe not for top-pairing minutes, but he should be good for 20 a night.
That isn't your argument at all. You've said that:
1. Lidstrom is the best defenseman in the NHL. You referenced past performance.
2. Any team would sign Lidstrom to a five year deal at his current age.
Now you're backing off and saying that hes declining with age. Which if is the case, its very easy to suggest that hes not the best defenseman in the league. Unless you're one of the blatant homers who honestly believed that Lidstrom was leaps and bounds ahead of Neidermeyer and Pronger and is just staring to come back down to Earth. If that is the case, than this argument is over.