John Cena is just a few days away from bidding adieu to in-ring competition in WWE. The GOAT will wrestle his final match against Gunther at Saturday Night's Main Event XLII this weekend. The Franchise Player has vowed never to compete inside a squared circle after December 13. After over two decades of being a center figure in the Stamford-based promotion, it's hard to imagine someone filling the void that will be left by John Cena.However, if there's one man who can come close to replacing The Last Real Champion, it's the six-time world champion, Roman Reigns. In this listicle, we will look at four reasons why WWE must choose the OTC as Cena's replacement.#4. Having Roman Reigns replace John Cena could see him work regular datesIn the past couple of years, Roman Reigns has adopted a part-time schedule. The OTC has not been a regular part of the programming and only makes sporadic appearances around major events.With The Cenation Leader officially retiring, WWE may need The Head of the Table to be around more than he is now. If Reigns is chosen to fill Cena's shoes, he could appear more frequently, as his presence has always benefited the product and the ratings.#3. Roman Reigns is already an established nameOne of the main reasons why replacing The Franchise Player is tough is that very few WWE Superstars have managed to become household names throughout the years, something Cena has been for a long time.Out of the current crop of talent, Roman Reigns is arguably the only one who comes close to Cena in popularity. Therefore, the OTC should be the one to replace The Never Seen 17.#2. He was initially chosen to be John Cena's successorAs John Cena began winding down his career in WWE, Roman Reigns was positioned to be The Franchise Player's successor as the face of the company. However, his Big Dog character couldn't connect with the audience as the management may have hoped for, something even Cena pointed out during their feud in 2017.Since Reigns has found his footing after becoming The Head of the Table, he has gained enough credibility to replace the 17-time world champion.#1. Mainstream appealAs mentioned before, John Cena has become a household name. While he has become a big-time Hollywood actor now, his popularity had transcended the wrestling world and into the mainstream media, even when he was a full-time WWE Superstar.The Stamford-based promotion has preferred their top star to have a certain mainstream appeal that can connect WWE to a wider audience. While Cena will continue to be an ambassador for the company after retiring, the global juggernaut may need an active star to represent them.Roman Reigns has done a commendable job as the top star of the promotion and certainly carries the mainstream appeal. Considering this, Reigns is the perfect replacement for Cena in WWE.