Wouldn't it just be delayed if any other remaining country were to block. I would just assume MS would fight them in court like the FTC and win an appeal. From what I understand only the UK has a unique structure where even if MS wins the appeal with CAT then it goes back to the CMA for review again.
So Even if MS gets blocked I think they would just keep winning appeals until the UK is isolated. If the CMA blocks again or CAT upholds the CMA decision then MS can just close everywhere but the UK and pay any fines just like Ben Affleck and Matt Damon did in that movie about basketball shoes.
Why do you think it would be a hurdle for ATVI?. I am sure MS will increase the breakup fee.
The FTC is unique in that it doesn't approve acquisitions, it can only sue to block them. So, either the FTC can let it pass or it needs to win in court to block the deal.
So technically the FTC hasn't blocked it yet. If the FTC wins in court, then Microsoft can appeal that decision.
If Microsoft gets to the CMA appeal process, I believe one major facet of their argument will be that the severity of the CMA's decision was too far (so far it was irrational). The bar for irrational is that no other reasonable regulator in the same position would make that decision. Again if this gets to appeal I think the CMA will point to the FTC as a regulatory body that has reached the same conclusion, but it hasn't technically blocked the acquisition yet. FTC needs to win in court first.
As for why July 18th will be the biggest hurdle to come, is because Activision will most likely be wanting to get the $3B termination fee and resume business as usual. Activision will really have to weigh how much of an increase in the break up fee is worth how much time in restricted business limbo.
And Microsoft has to be willing to lose even more money, probably in the billions to see the appeal process through. Microsoft will probably want to have a good idea of if they have a strong case for their appeal to the CMA before renegotiating. So if they don't have something ironclad I don't think they'll move forward past July 18th either. Also, Microsoft will most likely need to up how much they are paying for per share to get Activision's shareholders to agree to a couple more years of this restricted business limbo. Which is really a crapshoot, Microsoft has to guess what's a good enough price to offer to get Activision's shareholders to agree. At $105 a share Microsoft would be paying an extra $7B roughly. We don't know how much Microsoft is willing to spend to get Activision Blizzard King under their banner, and we don't know how much they're willing to lose for an unsuccessful appeal.
Negotiations are the biggest hurdle coming up.