It reads to me like you don't need to install Origin. Press release mentions EA games coming to Steam, and crossplay functionality between Steam and Origin.
Do we know for sure you won't need Origin anymore? I'm not sure if taking it out would make EA happy, even if they are once again on a bigger platform.
Then again, if you still need their DRM 3rd party software, we're in the same place as before...
You know it deserves the GOTY.