For now. GaN-based radars offer much-improved efficiency. I'm confident the PAF will pursue another AEW&C in 7-10 years, but it'll be interesting to see how. I'm sure the ideal scenario is the Erieye ER, but India's watching... The alternative is finding a GaN TRM supplier and using COTS input to design and build our own AEW&C.
Something like the Embraer Lineage 1000E (or E190-E2) might be able carry a large array up top and possibly three smaller arrays (one on each side of the fuselage and maybe one ground-facing one underneath). Could make for a monstrously capable platform, especially once you leverage distributed ELINT/SIGINT nodes, UAV feeds, etc.