That is actually accurate in the next 5 years. Presently, T1 would be relegated to PAL, both domestic and international, while T2 would be given to CEB domestic, while T3 would be for all international flights not PAL. When T2 and T3 Annex is constructed, all domestic would operate at T2, while all FSCs operate at T3.
I believe however that T1 would remain PAL. Why? In 5 years time Bulakan would already be open, and the first transferee there are the low cost carriers.
Making Sense