This whole idea of trading Matthews is idiotic. As a starter last year he nearly averaged 17PPG on shooting percentages of 45.1/42.0/84.3 (FG/3P/FT). Those are darn good numbers, pretty efficient.
Wes is not Brandon Roy, he won't do the same things for us. However, Wes is a good defender (I saw him defend the Nuggets PGs pretty well last year including Lawson before he twisted his ankle) and just plays the game the right way...has a winning attitude. Everything I've seen about him supports this idea. He's a gamer, and a good teammate.
Suggesting that someone with a PER of 9 is someone we want on the floor is horrible. I think I could maybe put up a better PER and I didn't even play high school ball (ok, not really, but it's pretty damn bad).
There just aren't many good (decent even) shooting guards available in the league and we happen to have one. If you haven't read it yet, you should read this article:
http://www.grantland.com/story/_/id/7323610/the-third-day-nba-christmas
In addition, Wes has a very attractive contract for a player of his caliber. If we had Roy and he was healthy that'd be one thing, but since that isn't the case I think you consider Wes a piece...well not necessarily to build around...but he's close to it. He's more likely to be a Blazer in 3 years than just about anyone else on the roster.
For what Wes brings (efficient scoring, plus defense, hustle, teamwork, and salary situation) I don't think we'd get back comparable talent for him. I hope he's around, because I think he'll continue to be an above average SG for the next few years in the league.