Yes, I've also been thinking this presents a difficult decision for City.
Juventus want to keep Pogba, their biggest star, as a statement. Meanwhile Bonucci is 29 and his value will never be higher.
Bonucci just signed a new contract but could earn double the wages and may not have another opportunity to play elsewhere, never mind with Pep.
City are between a rock and a hard place. Close in on Bonucci and they keep Pogba, so Real's "gentleman's agreement" over Kroos goes out the window. Or, they could take a punt on Pogba ending up at the Bernabeu and Real honoring their agreement, but losing out on Bonucci.
The key for Txiki is finding a way to get both. If not, well, maybe go for Bonucci and pick up Thiago instead.