Bring back the F-22. Do a high low replacing some F-35s with F-22s and others with F-16 Block 60s. The marines and navy still need the F-35.
And therein lies the cost problem. The reason, the ONLY reason why the F-35's costs are increasing, is because of rising development costs spread over fewer early production airframes.
The Air Force are currently scheduled to purchase over 1,700 F-35As and the Navy and Marine Corps a combined 680 -Bs and -Cs.
Drop the Air Force purchase, and the costs per aircraft for the Navy and Marine Corps shoots through the roof.
This is how we ended up with an effective cost of $350 million for each of the 187 F-22s.