I hope you're right but I expect you're wrong. With regard to the abortion issue Scheer has said quite clearly during his campaign he would let the issue be reopened and of course then swapped ends after he won the nomination knowing full well it wouldn't bode well during a run for the top spot.
Even if he wanted to reopen abortion it would likely get struck down in the courts and then he wouldn't be reelected. Or if it went through, it would just be reversed by the next government and again he wouldn't be reelected. This prevented Harper from touching these issues, strategically it would be a disaster. Costs are high, benefits are low.