You can;t know what isn't true.  So you can;t know that "conservative Catholics think doctrinal development aims to reverse [Church] teaching."  There's a difference between development and change.  

You say "progressives are progressive because they think things can be handled better than they are now."  True.  But if a "progressive" is simply one who "thinks things can be handled better than they are now," then everyone more sentient than my father's '54 Buick is a progressive.  I don't think you want to argue that.  No, progressives don;t want merely to develop doctrine, they want to change it . . . and fundamentally.  As in gay marriage, as in women priests, as in assisted suicide, as in abortion.  The question that continues to loom here is:  Why do so many people who reject basic Catholic teaching insist on calling themselves Catholic?  It's one of the most "intrinsically disordered" (no, not in that sense) phenomena I've ever seen.