Does this only show up in real player associations, or fictional associations as well? I did enable the inseason ratings changes when I upgraded my fictional association to PS2007, and while I haven't seen any evidence of this yet, I'm still in my first season since enabling this feature. I've been playing this same association for over three years (in "real time", not "game time"), so I'm really hoping this bug doesn't end up ruining this association for me over time.
If this is going to hit me eventually, I'd really like a new release at some point where I could disable this feature. The only reason I chose it was that I understood that I got a "one time chance" to decide whether my association would use it for the rest of eternity, and since it sounded cool, I went for it. At this point, though, I'm not sure I care one way or the other which way the ratings change - but I would care if I suddenly got players with "superpowers" dominating the league.