#2. 'Rowdy' Ronda Rousey
As the current RAW Women's Champion, it seems unlikely that Ronda Rousey would be going anywhere in 2019.
But despite having one of the most impressive rookie years in wrestling history, Rousey reportedly only signed a one-year deal with the company, with the UFC star wanting to realise her dream of being a professional wrestler.
Clearly having done so, it makes sense for Rousey to retire in 2019, as she has made it public her dreams of becoming a mother, something practically impossible if she's on the road.
Whilst the WWE would no-doubt be hoping to keep Rousey in the ring a little longer, this plan was reportedly made clear to WWE before the contract was signed to have her debut at the 2018 Rumble.
Simply put, Rousey had done everything she has wanted to do in WWE.