I agree that the majority will recognize it, but probably in the vein of "this sounds familiar" but know it word for word like we do? Nope.
I think a lot of people on this site lose sight of the fact that the vast majority of fans are not obsessed super fans as we are. Nearly every person I know who is a fan has at one time or another listened to Achtung or TJT, but I would say a good chunk of the casual fan base rarely listens to full albums. Especially in the era of music streaming. Of the group of 8 that I went to JT30 with, only 2 of us had regularly listened to anything other than the "big 3." From where I was on the floor, this seemed to be the overall feeling in the stadium as there was a huge lull in fan enthusiasm after side A. Not to say people didn't enjoy it or that it wasn't great, but people were clearly less familiar with every songs after Bullet. It would be the same--even more so considering Achtung wasn't quite as huge as TJT--for the deeper cuts off of Achtung Baby. This was a huge album yes, but huge nearly 3 decades ago.
To say that people who are shelling out $350 per ticket won't be familiar with every song off of Achtung Baby? Totally plausible. U2 shows are an event--a must see act. A lot of people going will be casual "greatest hits" fans, spouses and other people just going to see what the fuss is about.
UV got a great reaction on 360 because it was absolutely stunning visually, theatrically and sounded killer. Not to mention it is a pretty catchy/poppy chorus. The pulled out all stops and it was one of the absolute highlights of the show. If U2 are able to pull the same off with Acrobat, I would be thrilled. I'll be pumped to hear it live regardless how it is received by the crowd.
In reality, anyone who claims without reservation that Acrobat will be widely recognized or barely recognizable to the average fan is completely talking out of their ass. Unless somehow I missed the study that came out polling U2 concert goers about their listening habits, patterns, or knowledge of non singles cuts.
Hell, my own girlfriend of 4 years, who I thought I had "trained" well when it came to U2 and converted into a fan didn't recognize COBL or Bad (BAD!!) when we saw the band in Chicago 2015.