The problem in baseball is mediocrity. Mediocre teams take a LONG time to rebuild. The Sox retooled after the 2004 season, made the POs in 2005, missed out in 2006, but had a surge in 2007 because their farm was loaded. They stayed relevant until 2011 when the team died in September. They finished in last in 2012 then got career years out of everything they touched to win it in 2013 with the core of the 2007 team largely intact (Pedey, Papi, Lester) and big time help from the farm (Xander) during the POs. Their 2014-2015 teams were duds, but their strong farm system and enviable cap space allowed them to deal for studs or sign them and won the division 3 years in a row and a title last year. They’re not entirely heading for a major downturn in 2019, but they’re clearly not as good as the record setting team last year. The problems with this squad and the main reason for the cliff are two fold. The Sox have a TON of money tied up in this team. Each time the Sox reloaded and won a title, they could spend. Well, you’ve got Pedey, Price, Sale, Eovaldi and Bogaerts locked up at $111 mil annually for the next 3 seasons. That’s halfway to the second limit on 4 players, one of which will never play again, another who is a 34 yr old 5.5 inning pitcher, another is a flailing ace, and the last cannot stay healthy. The kids around this core are either expensive (Betts) or heading there and your farm is as thin as it has ever been. Staying in the race and flailing the team is a great way to deepen the cliff. The paid guys get old, the farm continues to get depleted in a quest to hold on and your checkbook reaches its limit.