Ask St. Joseph and St. John the Baptist. They were in a state of sanctifying grace but deprived of the beatific vision.
Define "can". God CAN do anything He wants.
I answer this the same way that Father Feeney did, that we do not know what happens. I am of the opinion that God will not let anyone die in this state ... justification without the Sacrament. If He were to allow it, then they could end up in a limbo type of state, basically perfect natural happiness ... only without the beatific vision.
Both St. John the Baptist and St. Joseph died in the Old Dispensation. It was replaced by the New. As soon as Christ opened Heaven, they both went there. I get really angry when I see such idiotic stuff being thrown out by armchair theologian who do not have the faintest idea about anything.
God CAN do anything He wants? Yes, because whatever He cannot do, He also cannot want. But it is false to say, strictly speaking, that God can do anything. There are a lot of things God cannot do. For example, He cannot sin, He cannot fail, He cannot cease to exist, He cannot create another God, etc.
We’re not interested in how Fr. Feeney answered anything but in how the Catholic Church answers these questions.