The answer may be simple, everything.
Steeler Nation was hit with a bombshell Tuesday, forcing it to contend with the notion that Ben Roethlisberger won't be around forever.
Almost a day after their big season ending loss, the Steelers are still recovering, they are still trying to learn from their mistakes and accept that their season is over.
As for Tomlin, he hasn't had his year-end meeting with Roethlisberger, which might be why he didn't sound completely concerned on Tuesday.
During his season-ending press conference on Tuesday, which was held just hours after Roethlisberger made his retirement comments, Tomlin said he wasn't "alarmed" by Big Ben's remarks, but he also added that the team would be ready for whatever decision Roethlisberger made.
It may seem a little outlandish of him contemplate his future in football, but it is not definite.
That nine-game winning streak feels galaxies away now. They may need some time to rest their minds, and realize this was not their year. And that move is much easier to make when the iconic quarterback is already sending signals that his time is dwindling.
Passenger train in Utah slams into truck at high speed
The UTA says at the time of the incident the gates were affected by weather conditions and were down and active, as programmed. Brown cardboard boxes were thrown through the air as the trailer was sliced in half by the sheer force of the passing train.
Bell, who was coming off games of 167 and 170 yards in his previous two playoff games, was given off Wednesday practices by Tomlin for the past month.
There were also indications that Roethlisberger and Tomlin had some uneasiness this season. The Patriots handled them easily.
Landry Jones, Roethlisberger's backup the last few years, is an unrestricted free agent this season, awful timing for the team to suddenly need a quarterback. By the final seconds left in the game the Steelers had blank looks on their face as they took a 17-36 loss to the Patriots.
Heading into the game, it was expected to be an offensive battle, and it was.
Would the Steelers want to kick the tires on Tyrod Taylor? "I'm not by any means saying that I'm not coming back or anything like that". That's $12 million in base salaries over three consecutive seasons, plus $5 million roster bonuses in 2018 and 2019. He will be due $19 million next season, and that is about $19 million reasons of good incentive. Currently, the only running backs that are under contract with the Steelers for the 2017 season are the four that signed futures deals on Monday and that includes Karlos Williams, the younger brother of linebacker Vince Williams.
Ben Roethlisberger is scheduled to meet with Dan Rooney and Art Rooney II today at Steelers headquarters. If Big Ben had thought about retirement in the past what could be the deciding factor for him?