With Maiden's track record thats what worrys me, NOTHING is set in stone until they sit down rehearse the song and feel comfortable with it, they simply wont play it just to please the fan demand if the band are not feeling it, all it will take is a 'didnt work' explanation AKA Infinite Dreams
My opinion: no incentive.
As a rule of the thumb, an average band will have two major motivations to do stuff: personal views on their art or money. Money-wise, Maiden already has a non-incentive to play any deep cuts (or any band does, really). As much as any social media focused on the fans hate, what draw crowds to Maiden's concerts are not Deja-Vu, Only the Good Die Young or Como Estais Amigos, but The Trooper, Fear of the Dark and Number of the Beast. Of course, Maiden usually goes against this trend when they feel like it (as in the AMOLAD 1st leg), but for pure monetary reasons their best action plan would make a 4 years LotB Tour followed by another 4 years Farewell Tour. We know this won't be the case, exactly for the other reason...
...they love their art. They are a band that are proud of their past and specially current works. They actually treat these classic tours as remembrance lanes and not as a quick-money grabber tour. Which brings to the very likely reason they do not play Infinite Dreams or other songs "heavily" asked: they don't feel like it. Maybe they did not like the arranges in Infinite Dreams, maybe Bruce did not like how he sounded on it, maybe Steve thinks it will tire his fingers, maybe Dave farted in the intro and now they cannot play it without breaking in laugher, the reasons are barely important because the only motivation for a band to play a song they do not like is money and I'm sorry but Infinite Dreams on a set would not increase their box totals in more than 0.1%. After all, this is why we waited so long to see Flight of Icarus: the band was split on how to perform it, so they decided to say "fuck it" and avoided up to the last second. This is a band with 17 studio albums and a band that already knows that will sold-out arenas (in Europe/NA/Asia), festivals and stadiums (in SA) just with a loop of the same 6 classics, so, yeah, they probably just did not like it and chose other song of their endless chest of songs they already know how it works and like the results.