Kogepan posted...Im not saying it will ever happen. But from a business point of view there is lots of good reasons to sell their stuff on Steam.
No, there is nearly zero point to selling their stuff on Steam.
Blizzard, like EA, developed their own platform for these services because Valves takes a cut from every game sold. Both Blizzard and EA have spent easily $1,000,000, if not more, on developing Origin and Battle.Net because, in the long term, royalties paid to Valve would cost more.
The only reason they would cut a deal with Valve is if a significant portion of their users refuse to play games unless they are on Steam. That will never happen.