All the raids will be awakened starting PrePatch, so I imagine bullions will still be a thing.
The only stuff likely going away when the season ends, whenever that is since Blizzard can’t give us useful information, will be the 0.1% title in M+, AoTC and CE. Everything else will likely still be obtainable until August 20th (the week TWW launches).
However, I’m just speculating due to the fact that Blizzard decided to release a loaded statement and not provide any information on it.