I was thinking about this. When you listen to SYW, you kind of jump off the 70s with What's the World Coming To, make a quick stop in the late 80s with Murrow, then jump to now with Illume. The album stays on a 90s-to-now feel until it hits Running Through the Garden and Silver Girl.
Songs that have a contemporary sound are Say You Will, Bleed to Love Her, Illume and Steal Your Heart Away. Years from now, these will be hard to place within a time context if you don't know when they came out. I would even say that for What's the World Coming To, despite its 70s-ish sound. Then you have the weirdo stuff, like Red Rover, Say Goodbye, etc. These may well become timeless songs, unless they become so closely identified with this time period, as the Tango songs became with theirs, that we'll always say, Oh, those are so 2003.
Time will tell. But I suspect the treatment Lindsey gave to things like Gotta Get Away, The Singer Not the Song, Someone's Gotta Change Your Mind and Twist of Fate might have given songs like Running Through the Garden a more contemporary feel.
Overall, what matters is if you enjoy the damn album.