Honestly, even if the PAF could field a new strike platform (the original plan was for 36 new fighters) for strategic roles and offload all conventional strike work to the JF-17, there's a benefit to having additional strike platforms in the Mirage III/5. If anything, it's 3~5 squadrons of nuclear attack fighters; and with much reduced operations, the PAF can keep them around for a very long time. If anything, it's dozens of additional headaches for India (especially now since we've proved the Mirages are a credible strike threat).