Step 3: Money in the Bank
In addition to not being pushed too hard, too fast, WWE should focus on Roman Reigns doing cool things for the time being. That's what got him over in the first place during the original Shield run.
Money in the Bank would be a good place to go back to those days. Roman Reigns could win a hard-hitting qualifying match against somebody like Randy Orton (should he move in the superstar shakeup as many expect him to). He could then go on to be the star of the match, being at the epicenter of all kinds of cool spots during the mayhem. Spears through tables, ladders, barricades, and so on are all fair game and would amp people up.
Roman Reigns could almost get the briefcase, only to be screwed over at the last minute by another of the four notable NXT call ups.