Could be that the owners strongly disagree on the path forward. Short, weird season, or not, the Dodgers are the 2020 World Champions, ending a prolonged drought for them. Even if 2021 is another weird, shortened season, likely a team will be crowned the new WC. With the prospect of a second season of revenue pain, teams that are willing to spend and pick up some worthy FA and stock up on baseball side management and scouts/development staff/quality analytical guys will likely get more bang for their buck than normal (fewer teams spending, opponents shedding talent which may be available on the cheap, probably won't have to pay 162 games worth of salary in 2021). If Middleton wants to spend to win, then 2021 might be the ideal time on this rebuild cycle.
I am saying 2021 is the year to strike if the goal is to reach and advance in playoffs. Going to WS probably not a possibility, unless we get really lucky. Obviously not the route to take if the goal is to trim $ losses. Even if the Phillies went the 'compete as hard as possible' route, lucked out, and became the 2021 WCs, they probably lose a bucket of $. The Dodgers probably lost $ in 2020, but I suspect they are happy to have the WC.
One thing making 2021 especially propitious for a team willing to take significant $ losses to win: the current Covid runaway is likely to last through the Christmas and New Year holidays, meaning hospitaloizations will be high through at least 3rd weak in January, i.e. likely through almost all of off-season. FA contracts will drop in $ value and years and teams will continue to want to cut salary $. Likely a bigger opportunity than 2020, where the off-season was normal through much of ST.