i appreciate wwe having an idea of who they want to focus on post-cena but don't strap a rocket to his ass for him to fumble the ball or even worse the crowd sees the favoritism and turns on him (cena part 2) a slow burn would work best for him (slow burn meaning a steady push up the midcard gaining experience and working within the shield and without them). They could use the Usos, The Rock and the WWE Performance Center as mentors and resources for him (and Tamina for that matter). Anyone who can reach main event level should be a blessing for WWE and they shouldn't use outdated modes of thinking (lolmidget) to squander potential moneymakers. WWE works best when the midcard AND main events are strong not just the main event.
Also I don't think they should abandon Rollins and Ambrose as a result of Reigns' rise. It would be a serious crime for Ambrose and Rollins to get left behind in the dust after all the goodwill they had this year. IMO The Shield is Wrestler(s) of the Year for 2013 and they are three major players for the future. Slow and steady pushes for all three benefits everyone: management (Reigns' look) smarks (Ambrose's quirks) and the live audience (Rollins' moveset).
just my two cents