I think it's a good move by the Blues. They now have plenty of cap room to sign offensive forwards, and with Brewer, Jackman, Woywitka, and Backman, you have 4 solid young multi-faceted top 4 material defencemen. They can be an excellent defensive nucleus for years to come.
Except we're supposed to have a 30 million budget, so we aren't going to sign any forwards..
His trade cannot be a panacea. If Pronger was traded for scoring forwards, you'd be complaining about how you have no one on the blue line.
Anyway, Spector's take
Spector's Note: My thanks to everyone who sent this in. It figures, perhaps the biggest trade of the year occurs well after I've gone to bed! Anyway, major bombshell deal here and totally out of character for the Oilers, who dealt away an established (if underappreciated) blueliner in Brewer and gave up a piece of their future in Woywitka. It's going to cost the Oilers a pretty penny to re-sign him long-term (perhaps the league max of $7.8 mil per season over three years), and given Pronger's injury history, this has the potential to blow up in Kevin Lowe's face. But if it works out as the Oilers hope, it could also turn them into a strong hockey club over the next couple of years. It'll be interesting to see how things turn out!
As for the Blues, we all knew something had to give as they couldn't possibly retain Pronger, Weight and Tkachuk's hefty salaries and still flesh out their roster. With this move, they free up salaries, get a good established young blueliner in Brewer and add more depth for their future with Woywitka. Smart move by Blues GM Larry Pleau.