NJ Ave - I'm thinking of a Mike Cameron (11% BB, 24% K for career, .195 ISO, close to .340 OBP) type of player. Maybe that is an unfair comparison. In his prime, Cameron was a 25 SB guy. You are probably right that it is too much to expect. Add that with stellar defense from age 24 to 30, and that is a star.
Taylor had that kind of walk rate in the high minors (2012 A+ on up). The K rate only started to push over 25% last year in AA and AAA. Granted, better pitchers, so not to unusual. If he were an 8% BB / 25% K guy, I'd really think we'd be in for some 5 WAR years.