These changes are all fine but what I really don't want is to get a couple months in and see Electro Static Pummeler and Felidar Guardian get the axe as Wizards become more aggressive with their balancing. This isn't Hearthstone. People don't get to disenchant Smuggler's Copter for 100% value and move on. Given how infrequent Standard bans are (last ones were Jace and Stoneforge I think?) that's a bit of an expectation that cards aren't going to get sidelined unless they are really wrecking up the joint and the format is unhealthy.
Yea, this. I even went and reviewed the decklists of the last few big events, thinking maybe I just hadn't been paying attention. The meta game looks more robust then it has for quite awhile. B/G delirium seemed to show up the most, but even then it's best showing was like 4 versions in a top 8, and in others it was 1-2 at most. That's close to oppressive, so banning emrakul at that oint makes the most sense. Yet, I'm seeing everyone say UW flash is the 'best' deck, or marvel is the 'best' deck.. then you add in W/R and mardu vehicles, and all the tier 1.5 decks like zombies, UW panharmonicon, etc.. and you are already at double the amount of viable decks as during ravnica/theros standard when nothing got close to being banned.
With the new tools coming out in aether revolt, I'm really surprised to see a card from kaladesh getting the axe. Yes, it was in a ton of lists, but that's the nature of making a good colorless card, it can go in everything.
There's good artifact hate, vehicle hate, and great creature removal coming in this set. I would have given the meta a chance to solve that specific problem on their own for one more PT.
In other words, ban Emrakul and then one (not both) of smuggler's copter or reflector mage. Probably reflector mage, since it has the least amount of time left in standard anyways. If there's 32 copies of smuggler's coptor in the top 8 of the PT, then ban it in 5 weeks.