From the opinion piece:
Last year, I pointed out how many big publishers came crawlin’ back to Steam after trying their own things: EA, Activision, Microsoft. This year, for the first time ever, two Blizzard games released on Steam: Overwatch and Diablo 4.
Hopefully not soon, but probably once Gabe is gone if i had to guess.
If steam goes public, might as well start packing the bug out bag because shit is going to go south real quick.