I have not asked the band this, but I would be surprised if we see any other full album anniversary tours, other than perhaps I&W or SFAM if they keep doing this long enough that we get to a major landmark anniversary for either of those again. I could maybe see a one-off or very small string of dates at most, and I doubt even that for most of their albums (I could maybe see that happening if they change their mind about filming The Astonishing, for example).
As far as playing Six Degrees in its entirety, that's an interesting one. I just don't see them taking up that much time in a set for one song. I know for me personally, even though it's my favorite song, I wouldn't really be that excited about getting it in a live show. We have great versions on live releases between Bucharest and Score, and it would just take up so much time in a set that I just wouldn't want it to take so much time away from other things.