Yes, I believe that there is a significant number of people who ought to leave the Church if they want certain kinds of change in the Church.  This is evidenced by the numerous and repeated suggestions by some of the commenters on this site that people leave the Catholic Church.
I also find that desire demonstrated in the belief that those who leave do so "because the lure of the 'world' is too tempting".  This is a way to discount the large numbers of people who are leaving, thereby indicating that a smaller Church, consisting only of those who are considered orthodox, is preferable to a larger one, in which questioning and push for change is acceptable.