The only reason to use the scrapper at this point is for expulsom. The latest numbers I saw is about 6 items to get one expulsom on average. If you don't need expulsom, then the 1-2 materials you get per scrap will likely not be worth it, especially for much longer. I believe leather and mail gear is already a loss over the vendor price, at least on my server.
What WOULD make scrapping worthwhile though was if the expulsom requirements on gear or for champion equipment were more reasonible and instead players needed 3-5 expulsom plus the rare crafting mat for each profession (to provide them some value) in order to increase their crafted item level by 5 levels up to 325. Though 8.1 will probably be too late to implement the system.