My 2 bits... I don't, and won't, use 2 quarterbacks, and I don't think you have to use 2 to win. I've won share of games and championships with 1 QB, and I never actually been tempted to change. And I'm always slightly, just slightly, irritated when I see a team using 'the rotation', because it's not the normal way football is played.
To me, it's not so much an exploit issue as it is a realism issue. Show me a league, professional/college/high school, that routinely uses a 2 QB system. This is football simulation. I'm glad it's being addressed, if only as a cosmetic thing...
As far as blitzing goes, blitzing works. I think the problem is that the other plays and styles don't work, like zone for example. In a perfect world (simulator) I should be able play different defenses and succeed. And I should be able to adjust my offense to beat my opponent's defense... That's football, baby! I know M2M and zone are being addressed, hopefully it will make more plays work...
I love this game, it's by far the best simulator I've played my 30 years of sims... My next fave was FBPro96.