I think by 2025, we may be looking at:
1. 1000 VT-4
2. Approx. 700 AKs
3. T-80UD 320
4. Type 85 IIAP 268
5. Approx. 600 AZ
6. Approx. 600 Type 59s
7. Type 69 II MP 158
6 from the list could be put in storage / reserve or even retired. If they are retired, perhaps AZs could be put in reserve / storage along with Type 69s, which also have been upgraded (?? or so I guestimate).
Ideally, PA would look to standardize on VT-4, AK and T-80 UD, keep in reserve Type 85, Type 69 and AZ, while retiring / giving away to FC Type 59s. This would create a meaningful war reserve which Pak so far has lacked. Also, since AZ and Type 85 shoot the same ammo as VT-4 / AK / T-80 UD, them being kept in reserve makes sense more than vanilla Type 59 / 69.