Point there, Oscar.
However the jockeying that may happen with the North may not reach that scale, so is it critical?
Plus; if push comes to shove, other means including 4.5+ will have to be used.
The Jockeying may not, but the threat perception will.. and "the sum of all fears" will create a certain paranoia to expedite such an induction of 5th gen aircraft.
The current known 5th gen threat.. the J-20.. isnt even suited to be taken as a serious aggressor.
The actual threat will remain to be China's own 4.5 gen programs in the J-11B and other mass capability upgrades.
Better EW, ADA assets.. and infrastructure is the call of the day.. the 5th gen can wait.