In fact, if they had continued to fight, who knows, maybe the player would have agreed. The chances were slim, but they existed, and Donnarumma would definitely have helped them. Nevertheless, he is now negotiating with Manchester City, but everything depends on whether they can keep Ederson, and if so, Donnarumma will not be needed even at Manchester City. Surprisingly, he may end up without a club.
I don't think there is a statement from Donnarumma himself in the name of going to a club that only plays in the Champions League so this provides an opportunity for Manchester United to recruit him.
But now Manchester City as a rival continues to strive to make an approach with Donnarumma because Pep Guardiola needs the figure of the goalkeeper as a substitute for Ederson.
Everything is still possible to happen and I am sure Donnarumma himself has a view of his future so that it decides to play in certain clubs must have gone through careful consideration.