In related news: Delta has just announced that they'll be retiring their entire 777 fleet (including the 77Ls used on LAX-SYD).
Speculative: It'll be interesting if DL continues with SYD and the JV with VA post-covid. The earliest Trans-Pac flying will resume will be early 2021 at the soonest. Some scenarios include
(1) DL continuing with LAX-SYD with the A350
(2) leaving LAX-SYD to VA or
(3) pull out entirely.
Personally i'd say it's 50/50 between Options 1 and 3.
DL taking option 1 would be in a likely scenario if DL does the sole SYD-LAX flying for the DL/VA group, with VA pulling out of SYD-LAX route and VA directing the 4x owned 77Ws onto daily MEL/BNE to LAX.
If DL takes Option 3, then the chances of VA sticking around on TransPac would be unlikely post-COVID. The other exception is in the unlikely situation of VA2 striking up a partnership with UA to handle LAX (in absence of the recently closed UA crew base in LAX) whilst UA handles SFO (UA hub) flying.